A156059 Composite numbers whose binary representation reads as decimal prime.

185, 247, 253, 295, 329, 355, 405, 425, 453, 471, 533, 539, 565, 583, 595, 671, 675, 689, 703, 755, 781, 785, 815, 841, 855, 925, 989, 1037, 1075, 1099, 1113, 1121, 1159, 1189, 1207, 1219, 1269, 1287, 1305, 1329, 1341, 1403, 1413, 1441, 1473, 1521, 1541

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Example

185 is composite & 10111001 is prime.
313 is not in the sequence as it is prime in base 10.

Mathematica

Select[Range[2900], ! PrimeQ[#]&&PrimeQ[FromDigits[IntegerDigits[#, 2]]]&] (* Vincenzo Librandi, Apr 18 2013 *)

Crossrefs

Cf. A065720, A007088, A036952.

Sequence in context: A262053 A362096 A157297 * A244248 A129311 A252272

Adjacent sequences: A156056 A156057 A156058 * A156060 A156061 A156062

Keyword

nonn,base

Author

Gerald Hillier, Feb 03 2009

Extensions

More terms from R. J. Mathar, Feb 10 2009

Edited by N. J. A. Sloane, Mar 17 2010

Status

approved