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URL: https://oeis.org/A135441

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A135441

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

1

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

AUTHOR

Zak Seidov, Feb 17 2008

EXTENSIONS

Corrected and extended by David Applegate, Feb 18 2008

STATUS

approved