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

Author

Gerald Hillier, Feb 03 2009

Keywords

• nonn
• base

Examples

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

Links

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

Crossrefs

Cf. A065720, A007088, A036952.

Programs

Mathematica

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

Extensions

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

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