A140784 a(n) = least member of A006881 whose difference from the following one equals n, or 0 if no such semiprime exists.

14, 55, 35, 6, 46, 15, 26, 437, 146, 237, 95, 1082, 818, 597, 1603, 2705, 2078, 4511, 1418, 2681, 14545, 13863, 37551, 6559, 16053, 55805, 26707, 17965, 308918, 32777, 41222, 35103, 393565, 219509, 153263, 87627, 2263057, 35981, 1789339, 741841

Offset: 1

Author

Philippe Lallouet (philip.lallouet(AT)orange.fr), Jul 13 2008

Keywords

• nonn

Examples

			If psd(j) = A006881(j), psd(1)=6 and psd(2)=10, hence a(4)=6; psd(3) =14 and psd(4)=15, hence a(1)=14
		

Crossrefs

Cf. A001358, A006881, A131109.

Extensions

Edited by N. J. A. Sloane, Jul 20 2008

Corrected a(21), a(22), a(36), extended by R. J. Mathar, Jul 23 2008