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