

A167459


Composite numbers in A166504, i.e., whose decimal expansion can be split up into prime numbers, with leading zeros allowed.


2



22, 25, 27, 32, 33, 35, 52, 55, 57, 72, 75, 77, 112, 115, 117, 132, 133, 135, 172, 175, 177, 192, 195, 202, 203, 205, 207, 213, 217, 219, 222, 225, 231, 232, 235, 237, 243, 247, 252, 253, 255, 259, 261, 267, 272, 273, 275, 279, 289, 292, 295, 297, 302, 303
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OFFSET

1,1


COMMENTS

In contrast to A066737 (which is a subsequence of this one), we allow for leading zeros in the "prime" substrings; the two sequences differ from n=24 on, with a(24)=202 which is not in A066737.
Sequence A166505 gives the difference, A167459 \ A066737 = A166504 \ A152242. Sequence A167458 gives the indices of the terms not in A066737.


LINKS

Table of n, a(n) for n=1..54.


FORMULA

A167459 = A002808 n A166504, where "n" means intersection.
A167459 \ A066737 = A166504 \ A152242.


PROG

(PARI) is_A167459(n) = !isprime(n) & is_A166504(n)


CROSSREFS

Cf. A002808, A066737, A121609, A166504, A167505.
Sequence in context: A177055 A186780 A034304 * A066737 A121609 A092631
Adjacent sequences: A167456 A167457 A167458 * A167460 A167461 A167462


KEYWORD

base,nonn


AUTHOR

M. F. Hasler, Nov 19 2009


STATUS

approved



