Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #13 May 02 2015 10:33:08
%S 11,23,29,31,43,45,46,47,59,61,63,71,79,83,87,91,93,94,95,109,113,118,
%T 119,123,125,126,127,151,157,167,171,173,174,175,179,181,182,183,186,
%U 187,189,190,191,219,223,229,233,235,237,238,239,241,245,246,247,251,253,254,255,271,283,286,287
%N 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).
%C Numbers such that A090418(n)>1. A090423 is a subsequence. - _M. F. Hasler_, Apr 21 2015
%H M. F. Hasler, <a href="/A257318/b257318.txt">Table of n, a(n) for n = 1..1000</a>
%e The first term is 11, as 11 in base 2 is 1011, which can be written either as (1011) or (10)(11).
%o (PARI) is_A257318(n)={A090418(n)>1} \\ _M. F. Hasler_, Apr 21 2015
%Y Cf. A090421.
%K nonn,base
%O 1,1
%A _Jeffrey Shallit_, Apr 20 2015