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Search: id:A056215
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| A056215 |
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Primes p for which the period of reciprocal = (p-1)/10. |
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+0
4
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| 281, 521, 1031, 1951, 2281, 2311, 2591, 3671, 5471, 5711, 6791, 7481, 8111, 8681, 8761, 9281, 9551, 10601, 11321, 12401, 13151, 13591, 14831, 14951, 15671, 16111, 16361, 18671, 21191, 21521, 21881, 24281, 24551, 25391, 25801, 25841, 26161
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Cyclic numbers of the tenth degree (or tenth order): the reciprocals of these numbers belong to one of ten different cycles. Each cycle has the (number minus 1)/10 digits.
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LINKS
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Index entries for sequences related to decimal expansion of 1/n
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MATHEMATICA
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f[n_Integer] := Block[{ds = Divisors[n - 1]}, (n - 1)/Take[ ds, Position[ PowerMod[ 10, ds, n], 1] [[1, 1]]] [[ -1]]]; Select[ Prime[ Range[4, 3000]], f[ # ] == 10 &]
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CROSSREFS
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Sequence in context: A142444 A139655 A098677 this_sequence A142397 A142546 A122710
Adjacent sequences: A056212 A056213 A056214 this_sequence A056216 A056217 A056218
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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), Sep 15 2004
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EXTENSIONS
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Entry rfevised by njas, Apr 30 2007
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