|
%I #15 Dec 21 2015 18:04:25
%S 0,0,0,0,0,1,0,2,1,2,3,2,2,4,4,3,5,6,4,6,5,5,7,4,7,6,7,7,5,5,8,8,8,8,
%T 9,10,9,7,13,10,10,11,13,10,10,10,11,15,18,13,10,13,14,16,12,18,12,15,
%U 12,11
%N Number of partitions of prime(n) into the sum of two semiprimes.
%H Harvey P. Dale, <a href="/A172366/b172366.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) = A072931(A000040(n)).
%e a(8)=2 because prime(8)=19=4(semiprime)+15(semiprime)=9(semiprime)+10(semiprime).
%t Table[Total[If[PrimeOmega[#]=={2,2},1,0]&/@Table[{x-n,n},{n,x/2}]],{x, Prime[ Range[60]]}] (* _Harvey P. Dale_, Dec 21 2015 *)
%Y Cf. A129363, A175933,
%K nonn
%O 1,8
%A _Juri-Stepan Gerasimov_, Nov 20 2010
%E Corrected and extended by _D. S. McNeil_, Nov 20 2010
|
