login
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).
3
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
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
KEYWORD
nonn,base
AUTHOR
Jeffrey Shallit, Apr 20 2015
STATUS
approved