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

Author

Jeffrey Shallit, Apr 20 2015

Keywords

• nonn
• base

Comments

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

Examples

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

Links

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

Crossrefs

Cf. A090421.

Programs

PARI

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