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A241245 Primes obtained by merging 4 successive digits in decimal expansion of sqrt (5). 1

%I #11 Mar 25 2018 08:16:34

%S 6067,7499,8969,4091,9173,8731,5209,9941,2749,4969,5081,5077,4253,

%T 2677,4447,3863,2153,7817,3191,9187,1879,6581,8053,1753,5003,2339,

%U 9241,3253,2539,2887,6299,8161,7759,2371,3907,7297,8641,2689,4099,3169,1693,7019,7541,5413

%N Primes obtained by merging 4 successive digits in decimal expansion of sqrt (5).

%C All the terms in the sequence are 4-digit primes because leading zeros are not permitted.

%H K. D. Bajpai, <a href="/A241245/b241245.txt">Table of n, a(n) for n = 1..1514</a>

%t With[{s5=FromDigits/@Partition[RealDigits[Sqrt[5],10,500][[1]],4,1]}, Select[ s5,IntegerLength[#]==4&&PrimeQ[#]&]] (* _Harvey P. Dale_, Mar 25 2018 *)

%Y Cf. A198161, A198162, A198163, A198164, A198165, A198166, A198169, A241149.

%K nonn,base

%O 1,1

%A _K. D. Bajpai_, Apr 18 2014

%E Mathematica program corrected by _Harvey P. Dale_, Mar 25 2018

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Last modified August 16 17:03 EDT 2024. Contains 375177 sequences. (Running on oeis4.)