The On-Line Encyclopedia of Integer Sequences (OEIS)

A135441 revision #2

A135441

Numbers n such that for any single digit d of n we see also the d-th semiprime sp(n) as substring of n.

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

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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,new

AUTHOR

Zak Seidov, Feb 17 2008

EXTENSIONS

Corrected and extended by David Applegate, Feb 18 2008

STATUS

approved