A156657 - OEIS

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A156657

Numbers that are not safe primes.

%I #2 Mar 30 2012 18:51:04

%S 0,1,2,3,4,6,8,9,10,12,13,14,15,16,17,18,19,20,21,22,24,25,26,27,28,

%T 29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,48,49,50,51,52,

%U 53,54,55,56,57,58,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77

%N Numbers that are not safe primes.

%C A156659(a(n)) = 0; complement of A005385; A059456 is a subsequence;

%C A010051(a(n))*A010051((a(n)-1)/2) = 0.

%K nonn

%O 1,3

%A _Reinhard Zumkeller_, Feb 13 2009