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%I #11 Nov 22 2015 15:23:13
%S 1,7,23,31,47,61,139,271,287,773,2131,40291
%N Integers for which the smallest k in A067760 such that n + 2^k is prime increases.
%H mersenneforum.org, <a href="http://www.mersenneforum.org/forumdisplay.php?f=86">Five or Bust - The Dual Sierpinski Problem</a>
%o (PARI) a=1; forstep(n=1, 773, 2, k=1; while(!ispseudoprime(n+2^k), k++); if(k+1>a, print1(n, ", "); a=k+1));
%Y Cf. A067760, A123252.
%Y A263875 gives the record values.
%K nonn,hard,more
%O 1,2
%A _Arkadiusz Wesolowski_, Oct 28 2015