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First differences of A257559.
1

%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