A098680 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A098680

Primes p whose period of reciprocal equals (p-1)/13.

2393, 15497, 18149, 18617, 20021, 25819, 26183, 26339, 29303, 39937, 42953, 48491, 52313, 53327, 57331, 58189, 59021, 65183, 81953, 82499, 87491, 91703, 98047, 102233, 104287, 109097, 111229, 119419, 129793, 131171, 143287, 143833, 162007

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

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, 15000]], f[ # ] == 13 &]

CROSSREFS

Cf. A097443, A055628, A056157, A056210, A056211, A056212, A056213, A056214, A056215, A056216, A056217, A135073.

Sequence in context: A253422 A100974 A279538 * A226149 A115931 A323344

Adjacent sequences: A098677 A098678 A098679 * A098681 A098682 A098683

KEYWORD

nonn,base

AUTHOR

Robert G. Wilson v, Sep 15 2004

STATUS

approved