A160901 a(n) = the smallest positive integer that is neither a multiple of c(n) nor is coprime to c(n), and is such that binary c(n) is a subsequence of a(n) written in binary; where c(n) = the n-th composite number.

18, 14, 34, 39, 26, 28, 30, 63, 66, 50, 52, 87, 54, 56, 115, 58, 111, 60, 62, 130, 135, 98, 285, 100, 102, 159, 104, 106, 108, 183, 110, 112, 399, 114, 207, 116, 118, 375, 120, 231, 122, 124, 126, 255, 258, 525, 194, 196, 279, 198, 200, 202, 303, 204, 623, 206

Offset

1,1

Comments

Only composites indexes are considered here because there are no positive integers that are neither coprime to, nor a multiple of, the primes or 1.

Links

Table of n, a(n) for n=1..56.

Crossrefs

Cf. A002808.

Sequence in context: A232505 A297939 A298550 * A159502 A077668 A298723

Adjacent sequences: A160898 A160899 A160900 * A160902 A160903 A160904

Keyword

base,nonn

Author

Leroy Quet, May 29 2009

Extensions

Extended by Ray Chandler, Jun 14 2009

Status

approved