A171963 Number of partitions of the n-th semiprime into two semiprimes.

0, 0, 0, 1, 1, 1, 1, 0, 2, 1, 0, 1, 3, 1, 3, 1, 3, 1, 5, 2, 2, 1, 3, 3, 3, 4, 2, 2, 4, 4, 8, 3, 3, 8, 4, 5, 8, 3, 6, 7, 3, 5, 7, 9, 5, 5, 7, 10, 7, 6, 11, 5, 8, 7, 5, 9, 8, 8, 9, 6, 10, 8, 8, 7, 11, 9, 9, 10, 9, 7, 15, 12, 10, 11, 9, 10, 15, 9, 12, 10, 12, 12, 13, 11, 11, 11, 15, 12, 17, 12, 13, 16, 14

Offset: 1

Author

Reinhard Zumkeller, Jan 21 2010

Keywords

• nonn

Comments

a(n) = A072931(A001358(n)).

Examples

			a(13) = A072931(A001358(13)) = A072931(35) = #{26+9,25+10,21+14} = #{2*13+3*3,5*5+2*5,3*7+2*7} = 3.
		

Links

• R. Zumkeller, Table of n, a(n) for n = 1..1000