cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A262727 Strong (2,3,5)-primes (see comments).

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%I A262727 #15 Nov 24 2015 01:41:54
%S A262727 2,7,13,41,151,173,181,223,331,641,1373,1759,2011,3061,4507,5867,9601,
%T A262727 13537,14533,14591,14821,15101,15161,30557,32707,37657,38653,45361,
%U A262727 46687,48463,54331,54773,59197,63853,70321,76031,77041,78101,87133,91541,95083
%N A262727 Strong (2,3,5)-primes (see comments).
%C A262727 Let V = (b(1), b(2),...,b(k)), where k > 1 and b(i) are distinct integers > 1 for j = 1..k. Call p a V-prime if the digits of p in base b(1) spell a prime in each of the bases b(2), ..., b(k). Call p a strong V-prime if p is a (b(j),...,b(k))-prime for each of the vectors (b(j),...,b(k)), for j = 1..k.
%t A262727 {b1, b2, b3} = {2, 3, 5}; z = 50000;
%t A262727 u = Select[Prime[Range[z]],
%t A262727 PrimeQ[FromDigits[IntegerDigits[#, b1], b2]] &&
%t A262727 PrimeQ[FromDigits[IntegerDigits[#, b1], b3]] &&
%t A262727 PrimeQ[FromDigits[IntegerDigits[#, b2], b3]] &]
%t A262727 (* _Peter J. C. Moses_, Sep 27 2015 *)
%Y A262727 Cf. A000040, A235266, A262728.
%K A262727 nonn,easy,base
%O A262727 1,1
%A A262727 _Clark Kimberling_, Nov 07 2015