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 A098680 Primes p whose period of reciprocal equals (p-1)/13. 12
 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 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

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Last modified July 26 16:44 EDT 2021. Contains 346294 sequences. (Running on oeis4.)