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A084345
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Numbers with a nonprime number of 1's in their binary expansion (complement of A052294).
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6
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0, 1, 2, 4, 8, 15, 16, 23, 27, 29, 30, 32, 39, 43, 45, 46, 51, 53, 54, 57, 58, 60, 63, 64, 71, 75, 77, 78, 83, 85, 86, 89, 90, 92, 95, 99, 101, 102, 105, 106, 108, 111, 113, 114, 116, 119, 120, 123, 125, 126, 128, 135, 139, 141, 142, 147, 149, 150, 153, 154, 156, 159, 163
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listen;
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internal format)
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OFFSET
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1,3
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LINKS
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EXAMPLE
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15 is in the sequence because 15_10=1111_2 and 1+1+1+1=4 is composite.
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MATHEMATICA
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Select[Range[200], !PrimeQ[DigitCount[#, 2, 1]]&] (* Harvey P. Dale, Jan 21 2013 *)
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PROG
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(PARI) for(n=0, 200, b=binary(n); if(!isprime(sum(m=1, matsize(b)[2], b[m])), print1(n, ", ")))
(Haskell)
a084345 n = a084345_list !! (n-1)
a084345_list = filter ((== 0) . a010051' . a000120) [0..]
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CROSSREFS
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KEYWORD
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easy,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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