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Search: id:A084345
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| A084345 |
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Nonprime number of 1's in binary expansion (complement of A052294). |
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+0
2
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| 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
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(5)=15 because 15_10=1111_2 and 1+1+1+1=4 is composite.
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PROGRAM
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(PARI) for(n=1, 200, b=binary(n); if(!isprime(sum(m=1, matsize(b)[2], b[m])), print1(n, ", ")))
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CROSSREFS
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Cf. A052294.
Adjacent sequences: A084342 A084343 A084344 this_sequence A084346 A084347 A084348
Sequence in context: A097100 A002954 A019278 this_sequence A084561 A078613 A072202
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com) Jun 22 2003
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EXTENSIONS
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More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), Jun 23 2003
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