Spurious relationship: Difference between revisions

Revision as of 23:28, 13 January 2014

In recreational mathematics, a Keith number or repfigit number (short for repetitive Fibonacci-like digit) is a number in the following integer sequence:

14, 19, 28, 47, 61, 75, 197, 742, 1104, 1537, 2208, 2580, ....^[1]

Keith numbers were introduced by Mike Keith in 1987.^[2] They are computationally very challenging to find, with only about 100 known.

Introduction

To determine whether an n-digit number N is a Keith number, create a Fibonacci-like sequence that starts with the n decimal digits of N, putting the most significant digit first. Then continue the sequence, where each subsequent term is the sum of the previous n terms. By definition, N is a Keith number if N appears in the sequence thus constructed.

As an example, consider the 3-digit number N = 197. The sequence goes like this:

1, 9, 7, 17, 33, 57, 107, 197, 361, ...

Because 197 appears in the sequence, 197 is seen to be indeed a Keith number.

Definition

A Keith number is a positive integer N that appears as a term in a linear recurrence relation with initial terms based on its own decimal digits. Given an n-digit number

N=\sum _{i=0}^{n-1}10^{i}{d_{i}},

a sequence $S_{N}$ is formed with initial terms $d_{n-1},d_{n-2},\ldots ,d_{1},d_{0}$ and with a general term produced as the sum of the previous n terms. If the number N appears in the sequence $S_{N}$ , then N is said to be a Keith number. One-digit numbers possess the Keith property trivially, and are usually excluded.

Finding Keith numbers

Whether or not there are infinitely many Keith numbers is currently a matter of speculation. Keith numbers are rare and hard to find. They can be found by exhaustive search and, unfortunately, no more efficient algorithm is known.^[3] According to Keith, on average $\textstyle {\frac {9}{10}}\log _{2}{10}\approx 2.99$ Keith numbers are expected between successive powers of 10.^[4] Known results seem to support this.

Examples

14, 19, 28, 47, 61, 75, 197, 742, 1104, 1537, 2208, 2580, 3684, 4788, 7385, 7647, 7909, 31331, 34285, 34348, 55604, 62662, 86935, 93993, 120284, 129106, 147640, 156146, 174680, 183186, 298320, 355419, 694280, 925993, 1084051, 7913837, 11436171, 33445755, 44121607, 129572008,^[1] 251133297.

Keith clusters

A Keith cluster is a related set of Keith numbers such that one is a multiple of another. For example, (14, 28), (1104, 2208), and (31331, 62662, 93993). These are possibly the only three examples of a Keith cluster.^[5]

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

Template:Classes of natural numbers

↑ ^1.0 ^1.1 Template:SloanesRef
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The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

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[2] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

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+In [[recreational mathematics]], a '''Keith number''' or '''repfigit number''' (short for '''rep'''etitive '''F'''ibonacci-like d'''igit''') is a number in the following [[integer sequence]]:
+:14, 19, 28, 47, 61, 75, 197, 742, 1104, 1537, 2208, 2580, ....<ref name=OEIS>{{SloanesRef|sequencenumber=A007629|name=Repfigit (REPetitive FIbonacci-like diGIT) numbers (or Keith numbers) }}</ref>
+Keith numbers were introduced by [[Mike Keith (mathematician)|Mike Keith]] in 1987.<ref>{{cite journal | authorlink = Mike Keith (mathematician) | first = Mike | last = Keith | title = Repfigit Numbers | journal = [[Journal of Recreational Mathematics]] | volume = 19 | year = 1987 }}</ref>
+They are computationally very challenging to find, with only about 100 known.
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+==Introduction==
+To determine whether an ''n''-digit number ''N'' is a Keith number, create a [[Fibonacci number|Fibonacci-like]] sequence that starts with the ''n'' decimal digits of ''N'', putting the most significant digit first. Then continue the sequence, where each subsequent term is the sum of the previous ''n'' terms. By definition, ''N'' is a Keith number if ''N'' appears in the sequence thus constructed.
+As an example, consider the 3-digit number ''N''&nbsp;=&nbsp;197. The sequence goes like this:
+:'''1''', '''9''', '''7''', 17, 33, 57, 107, 197, 361, ...
+Because 197 appears in the sequence, 197 is seen to be indeed a Keith number.
+==Definition==
+A Keith number is a positive integer ''N'' that appears as a term in a linear [[recurrence relation]] with initial terms based on its own decimal digits. Given an ''n''-digit number
+:<math>N=\sum_{i=0}^{n-1} 10^i  {d_i},</math>
+a sequence <math>S_N</math> is formed with initial terms <math>d_{n-1}, d_{n-2},\ldots, d_1, d_0</math> and with a general term produced as the sum of the previous ''n'' terms. If the number ''N'' appears in the sequence <math>S_N</math>, then ''N'' is said to be a Keith number. One-digit numbers possess the Keith property trivially, and are usually excluded.
+==Finding Keith numbers==
+Whether or not there are infinitely many Keith numbers is currently a matter of speculation. Keith numbers are rare and hard to find. They can be found by exhaustive search and, unfortunately, no more efficient algorithm is known.<ref>{{cite web | last1 = Earls | first1 = Jason | last2 = Lichtblau | first2 = Daniel | last3 = Weisstein | first3 = Eric W. | authorlink = Eric W. Weisstein| title = Keith Number | publisher = [[MathWorld]] | url = http://mathworld.wolfram.com/KeithNumber.html }}</ref>
+According to Keith, on average <math>\textstyle\frac{9}{10}\log_2{10}\approx 2.99</math> Keith numbers are expected between successive powers of 10.<ref>{{cite web | authorlink = Mike Keith (mathematician) | first = Mike | last = Keith | title = Keith Numbers | url = http://www.cadaeic.net/keithnum.htm }}</ref> Known results seem to support this.
+==Examples==
+[[14 (number)|14]], [[19 (number)|19]], [[28 (number)|28]], [[47 (number)|47]], [[61 (number)|61]], [[75 (number)|75]], 197, 742, 1104, 1537, 2208, 2580, 3684, 4788, 7385, 7647, 7909, 31331, 34285, 34348, 55604, 62662, 86935, 93993, 120284, 129106, 147640, 156146, 174680, 183186, 298320, 355419, 694280, 925993, 1084051, 7913837, 11436171, 33445755, 44121607, 129572008,<ref name=OEIS/> 251133297.
+==Keith clusters==
+A Keith cluster is a related set of Keith numbers such that one is a multiple of another. For example,
+(14, 28), (1104, 2208), and (31331, 62662, 93993). These are possibly the only three examples of a Keith cluster.<ref>{{cite web|last=Copeland|first=Ed|title=14 197 and other Keith Numbers|url=http://www.numberphile.com/videos/197_keith.html|work=Numberphile|publisher=[[Brady Haran]]}}</ref>
+==References==
+{{Reflist}}
+==External links==
+{{Classes of natural numbers}}
+[[Category:Base-dependent integer sequences]]

Spurious relationship: Difference between revisions

Revision as of 23:28, 13 January 2014

Contents

Introduction

Definition

Finding Keith numbers

Examples

Keith clusters

References

External links

Navigation menu

Spurious relationship: Difference between revisions

Revision as of 23:28, 13 January 2014

Introduction

Definition

Finding Keith numbers

Examples

Keith clusters

References

External links

Navigation menu

Search