A257318 Numbers n whose binary expansion can be written as the concatenation of the binary expansion of prime numbers in at least two different ways (not allowing leading zeros).

11, 23, 29, 31, 43, 45, 46, 47, 59, 61, 63, 71, 79, 83, 87, 91, 93, 94, 95, 109, 113, 118, 119, 123, 125, 126, 127, 151, 157, 167, 171, 173, 174, 175, 179, 181, 182, 183, 186, 187, 189, 190, 191, 219, 223, 229, 233, 235, 237, 238, 239, 241, 245, 246, 247, 251, 253, 254, 255, 271, 283, 286, 287

Offset

1,1

Comments

Numbers such that A090418(n)>1. A090423 is a subsequence. - M. F. Hasler, Apr 21 2015

Links

M. F. Hasler, Table of n, a(n) for n = 1..1000

Example

The first term is 11, as 11 in base 2 is 1011, which can be written either as (1011) or (10)(11).

Prog

(PARI) is_A257318(n)={A090418(n)>1} \\ M. F. Hasler, Apr 21 2015

Crossrefs

Cf. A090421.

Sequence in context: A061752 A122259 A157173 * A090423 A232085 A086102

Adjacent sequences: A257315 A257316 A257317 * A257319 A257320 A257321

Keyword

nonn,base

Author

Jeffrey Shallit, Apr 20 2015

Status

approved