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

1,1

Links

Table of n, a(n) for n=1..40.

Example

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.

Sequence in context: A006597 A304294 A114012 * A022285 A100157 A144555

Adjacent sequences: A140781 A140782 A140783 * A140785 A140786 A140787

Keyword

nonn

Author

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

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

Status

approved