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

%I #15 Nov 24 2015 01:41:54

%S 2,7,13,41,151,173,181,223,331,641,1373,1759,2011,3061,4507,5867,9601,

%T 13537,14533,14591,14821,15101,15161,30557,32707,37657,38653,45361,

%U 46687,48463,54331,54773,59197,63853,70321,76031,77041,78101,87133,91541,95083

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

%C 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 {b1, b2, b3} = {2, 3, 5}; z = 50000;

%t u = Select[Prime[Range[z]],

%t PrimeQ[FromDigits[IntegerDigits[#, b1], b2]] &&

%t PrimeQ[FromDigits[IntegerDigits[#, b1], b3]] &&

%t PrimeQ[FromDigits[IntegerDigits[#, b2], b3]] &]

%t (* _Peter J. C. Moses_, Sep 27 2015 *)

%Y Cf. A000040, A235266, A262728.

%K nonn,easy,base

%O 1,1

%A _Clark Kimberling_, Nov 07 2015

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