%I #15 Oct 29 2013 14:46:38
%S 3,53,19,3,19,593,313,113,1699,1163,31,4217,31,47,7993,1013,631,347,
%T 3793,3923,397,353,2551,83,2719,971,3709,6827,6361,593,2053,16073,
%U 2719,2753,4441,8663,31,131,61,5867,379,587,9631,1907,8581,23,15739,4049,2281
%N Smallest prime k such that k*2^n-1 , k*2^n-1+2*j , k*2^n-1+4*j or k*2^n-1-2*j , k*2^n-1 , k*2^n-1+2*j are consecutive primes in arithmetic progression for some j.
%H Pierre CAMI, <a href="/A228452/b228452.txt">Table of n, a(n) for n = 1..350</a>
%H Pierre CAMI, <a href="/A228452/a228452.txt">PFGW Script</a>
%e 53*2^2-1-12=199, 53*2^2-1=211 and 53*2^2-1+12=223, so a(2)=53.
%e 19*2^3-1=151, 19*2^3-1+6=157 and 19*2^3-1+12=163, so a(3)=19.
%Y Cf. A227888.
%K nonn
%O 1,1
%A _Pierre CAMI_, Oct 27 2013