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Search: id:A084420
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| A084420 |
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Least number k such that between k! and (k+1)! there are n powers of ten. |
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+0
1
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| 3, 14, 103, 1042, 10158, 100502, 1000617, 10006509, 100019088, 1000004377, 10000170793, 100000442970, 1000001981666, 10000005339905
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(15)>100000018000000.
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MATHEMATICA
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LogBase10Stirling[n_] := Floor[ Log[10, 2 Pi n]/2 + n * Log[10, n/E] + Log[10, 1 + 1/(12n) + 1/(288n^2) - 139/(51840n^3) - 571/(2488320n^4) + 163879/(209018880n^5)]]; Do[k = 10^(n - 1); While[ LogBase10Stirling[k + 1] - LogBase10Stirling[k] < n, k++ ]; a[n] = k; Print[ a[n]], {n, 1, 14}]
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CROSSREFS
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Cf. A084321.
Adjacent sequences: A084417 A084418 A084419 this_sequence A084421 A084422 A084423
Sequence in context: A076015 A004659 A054202 this_sequence A051106 A121951 A085244
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 26 2003
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