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A020646
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Least positive integer k for which 7^n divides k!.
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2
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1, 7, 14, 21, 28, 35, 42, 49, 49, 56, 63, 70, 77, 84, 91, 98, 98, 105, 112, 119, 126, 133, 140, 147, 147, 154, 161, 168, 175, 182, 189, 196, 196, 203, 210, 217, 224, 231, 238, 245, 245, 252, 259, 266, 273, 280, 287, 294, 294, 301, 308, 315, 322, 329, 336, 343, 343, 343, 350
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| F. Smarandache, "Only Problems, not Solutions!", Xiquan Publ., Phoenix-Chicago, 1993.
H. Ibstedt, Smarandache Primitive Numbers, Smarandache Notions Journal, Vol. 8, No. 1-2-3, 1997, 216-229.
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LINKS
| T. D. Noe, Table of n, a(n) for n=0..1000
M. L. Perez et al., eds., Smarandache Notions Journal
F. Smarandache, Only Problems, Not Solutions!
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CROSSREFS
| Cf. A007843, A007844, A007845.
Sequence in context: A109048 A044892 A004959 * A008589 A085130 A080194
Adjacent sequences: A020643 A020644 A020645 * A020647 A020648 A020649
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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