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Search: id:A084087
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| A084087 |
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Not divisible by 3 and exponent of highest power of 2 dividing a(n) is even. |
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+0
3
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| 1, 4, 5, 7, 11, 13, 16, 17, 19, 20, 23, 25, 28, 29, 31, 35, 37, 41, 43, 44, 47, 49, 52, 53, 55, 59, 61, 64, 65, 67, 68, 71, 73, 76, 77, 79, 80, 83, 85, 89, 91, 92, 95, 97, 100, 101, 103, 107, 109, 112, 113, 115, 116, 119, 121, 124, 125, 127, 131
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n) is both in A001651 and A003159. a(n) is either in A084088 or in A084089.
Complement of union_of ({k==0 mod 3},{2a(n)}) (A084090).
It seems that lim(n->inf, a(n)/n) = 9/4.
Positions of nonzero coefficients in expansion of sum(k>=0, x^2^k/(1+x^2^k+x^2^(k+1))) (A084091).
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PROGRAM
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(PARI) for(n=0, 100, if(valuation(n, 2)%2==0&&n%3, print1(n", ")))
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CROSSREFS
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Sequence in context: A074300 A047375 A005487 this_sequence A080327 A062709 A129302
Adjacent sequences: A084084 A084085 A084086 this_sequence A084088 A084089 A084090
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KEYWORD
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nonn
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AUTHOR
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Ralf Stephan (ralf(AT)ark.in-berlin.de), May 11 2003
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