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A156059
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Composite numbers whose binary representation reads as decimal prime.
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2
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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
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OFFSET
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1,1
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LINKS
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EXAMPLE
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185 is composite & 10111001 is prime.
313 is not in the sequence as it is prime in base 10.
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MATHEMATICA
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Select[Range[2900], ! PrimeQ[#]&&PrimeQ[FromDigits[IntegerDigits[#, 2]]]&] (* Vincenzo Librandi, Apr 18 2013 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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