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Search: id:A085355
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| A085355 |
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a(n) is the difference between A084321(n) and the (n-1)th power of 2. |
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+0
3
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| 0, 1, 1, 2, 3, 3, 0, 11, 0, 24, 37, 47, 73, 90, 133, 135, 110, 133, 435, 795, 317, 1674, 1217, 1975, 4816, 6177, 9483, 11885, 17724, 19562, 22958, 39870, 48417, 85452, 114676, 210482, 133092, 194048, 524165, 451743, 1145779, 1292884, 1604772, 2859433, 4032594
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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A084321 is the least number k such that between k! and (k+1)! there are n powers of 2.
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MATHEMATICA
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LogBase2Stirling[n_] := Floor[ Log[2, 2 Pi n]/2 + n*Log[2, n/E] + Log[2, 1 + 1/(12n) + 1/(288n^2) - 139/(51840n^3) - 571/(2488320n^4) + 163879/(209018880n^5)]]; Do[k = 2^(n - 1); While[ LogBase2Stirling[k + 1] - LogBase2Stirling[k] < n, k++ ]; a[n] = k, {n, 1, 45}]; Table[ a[n] - 2^(n - 1), {n, 1, 45}]
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CROSSREFS
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Cf. A084321.
Sequence in context: A138003 A057682 A124841 this_sequence A103120 A021433 A124798
Adjacent sequences: A085352 A085353 A085354 this_sequence A085356 A085357 A085358
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu) and Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 24 2003
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