|
Search: id:A056212
|
|
|
| A056212 |
|
Primes p for which the period of reciprocal = (p-1)/7. |
|
+0
3
|
|
| 211, 617, 1499, 2087, 2857, 6007, 6469, 7127, 7211, 7589, 9661, 10193, 13259, 13553, 14771, 18047, 18257, 19937, 20903, 21379, 23549, 26153, 27259, 27539, 32299, 33181, 33461, 34847, 35491, 35897, 41651, 42407, 42491, 43051, 43793
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Cyclic numbers of the seventh degree (or seventh order): the reciprocals of these numbers belong to one of seven different cycles. Each cycle has the (number minus 1)/7 digits.
|
|
LINKS
|
Index entries for sequences related to decimal expansion of 1/n
|
|
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, 4700]], f[ # ] == 7 &]
|
|
CROSSREFS
|
Sequence in context: A076167 A032659 A098674 this_sequence A137770 A142761 A104299
Adjacent sequences: A056209 A056210 A056211 this_sequence A056213 A056214 A056215
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 02 2000
|
|
EXTENSIONS
|
Edited by njas, Apr 30 2007
|
|
|
Search completed in 0.002 seconds
|
