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A056213
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Primes p for which the period of reciprocal = (p-1)/8.
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3
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41, 241, 1601, 1609, 2441, 2969, 3041, 3449, 3929, 4001, 4409, 5009, 6089, 6521, 6841, 8161, 8329, 8609, 9001, 9041, 9929, 13001, 13241, 14081, 14929, 16001, 16481, 17489, 17881, 18121, 19001, 20249, 20641, 20921, 21529, 22481, 23801
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Cyclic numbers of the eighth degree (or eighth order): the reciprocals of these numbers belong to one of eight different cycles. Each cycle has the (number minus 1)/8 digits.
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LINKS
| Index entries for sequences related to decimal expansion of 1/n
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MATHEMATICA
| 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, 2700]], f[ # ] == 8 &]
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CROSSREFS
| Sequence in context: A201786 A167443 A098675 * A068707 A069761 A140634
Adjacent sequences: A056210 A056211 A056212 * A056214 A056215 A056216
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KEYWORD
| nonn,base
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 02 2000
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 30 2007
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