A167459 Composite numbers in A166504, i.e., whose decimal expansion can be split up into prime numbers, with leading zeros allowed.

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

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