A135441 Numbers k such that for any single digit d of k the d-th semiprime sp(k) is substring of k.

104, 410, 1004, 1014, 1040, 1041, 1044, 1104, 1410, 4010, 4100, 4101, 4104, 4110, 4410, 10004, 10014, 10040, 10041, 10044, 10104, 10114, 10140, 10141, 10144, 10145, 10400, 10401, 10404, 10410, 10411, 10414, 10440, 10441, 10444, 10514, 11004, 11014, 11040

Offset

1,1

Comments

sp(1..9)=4,6,9,10,14,15,21,22,25, with the convention that sp(0)=1.

Links

David Applegate, Table of n, a(n) for n = 1..300

Crossrefs

Cf. A134439, A134962, A135463.

Sequence in context: A300032 A185763 A220063 * A188150 A234227 A234220

Adjacent sequences: A135438 A135439 A135440 * A135442 A135443 A135444

Keyword

nonn,base

Author

Zak Seidov, Feb 17 2008

Extensions

Corrected and extended by David Applegate, Feb 18 2008

Status

approved