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Search: id:A090417
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| A090417 |
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a(n) = if Floor[2*Pi*n/(E*Log[n])] is prime then Floor[2*Pi*n/(E*Log[m])] |
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+0
2
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| 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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An entropy power of white noise function with N=1/log(n).
Function is based on asymptotic form of distribution: PrimePi[n]--> n/log(n) Function misses the first three primes {2,3,5}, but is pretty good after that.
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REFERENCES
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C. E. Shannon, The Mathematical Theory of Communication, page 93
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MATHEMATICA
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digits=5*200 f[n_]=Floor[2*Pi*n/(E*Log[n])] a=Delete[Union[Table[If [PrimeQ[f[n]]==True, f[n], 0], {n, 2, digits}]], 1]
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CROSSREFS
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Sequence in context: A070884 A135777 A090459 this_sequence A020631 A020637 A020633
Adjacent sequences: A090414 A090415 A090416 this_sequence A090418 A090419 A090420
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jan 31 2004
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