A244269 - OEIS

%I #6 Jun 24 2014 14:21:26

%S 2,59,67,89,113,211,239,307,379,421,593,701,907,1283,1367,1759,1777,

%T 1823,1867,2131,2179,2467,2663,2753,2861,2953,3109,3389,3407,3463,

%U 3517,4457,4481,4583,4759,5077,5227,5437,5501,7043,7103,7253,7331,7541,7673,7703,7919,8087,8221,8363,8461,8609,8783,8923,9001

%N Primes p such that 1p2p3p4p5p6p7p8p9 is prime.

%e 59 is prime and 1592593594595596597598599 is prime. Thus 59 is a member of this sequence.

%o (PARI) for(n=1,10^4,b="";for(i=3,19,if(i==Mod(1,2),b=concat(b,Str((i-1)/2)));if(i==Mod(0,2),b=concat(b,Str(prime(n)))));if(ispseudoprime(eval(b)),print1(prime(n),", ")))

%Y Cf. A244268.

%K nonn,base,less

%O 1,1

%A _Derek Orr_, Jun 24 2014