%I #9 May 01 2015 10:37:45
%S 2,3,5,7,12,13,16,20,24,27,28,33,41,43,45,48,51,56,57,62,65,69,71,76,
%T 77,82,84,86,87,88,91,92,93,96,97,103,105,106,114,116,118,125,133,135,
%U 137,140,143,147,149,155,158,162,165,167,172,176,177,183
%N First differences of A257559.
%C By definition this sequence is strictly increasing. Heuristically a(n) is around 2n log n/log log n. - _Charles R Greathouse IV_, May 01 2015
%H Zak Seidov, <a href="/A257560/b257560.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) = A257559(n+1) - A257559(n).
%o (PARI) issemi(n)=bigomega(n)==2
%o t=0; v=List(); last=4; while(1, n=last+t; while(!issemi(n++), ); listput(v, t=n-last); if(v==100, return(Set(v))); last=n) \\ _Charles R Greathouse IV_, May 01 2015
%Y Cf. A257559.
%K nonn
%O 1,1
%A _Zak Seidov_, Apr 30 2015