A103809 - OEIS

A103809

Primes from merging of 5 successive digits in decimal expansion of the Golden Ratio, (1+sqrt(5))/2.

39887, 36563, 98057, 28621, 41893, 93911, 39113, 68917, 26633, 53693, 36931, 69317, 93179, 31793, 56383, 44381, 38149, 12203, 92461, 43207, 32077, 20771, 87433, 44221, 47809, 24007, 51797, 97883, 56249, 89069, 90697, 10427, 11177

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OFFSET

1,1

COMMENTS

Leading zeros are not permitted, so each term is 5 digits in length. - Harvey P. Dale, Oct 23 2011

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Simon Plouffe, Expansion of the Golden Ratio done to 20,000 digits as part of project Gutenberg.

Eric Weisstein's World of Mathematics, Golden Ratio.

MATHEMATICA

With[{len=5}, FromDigits/@Select[Partition[RealDigits[GoldenRatio, 10, 1000][[1]], len, 1], PrimeQ[FromDigits[#]] && IntegerLength[ FromDigits[#]] == len&]] (* Harvey P. Dale, Oct 23 2011 *)

CROSSREFS

Sequence in context: A235255 A234920 A116220 * A257192 A257185 A254985

Adjacent sequences: A103806 A103807 A103808 * A103810 A103811 A103812

KEYWORD

nonn,base

AUTHOR

Andrew G. West (WestA(AT)wlu.edu), Mar 29 2005

EXTENSIONS

Offset changed from 0 to 1 by Vincenzo Librandi, Apr 22 2013

STATUS

approved