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A020179 Pseudoprimes to base 51. 1
10, 25, 50, 65, 70, 91, 175, 325, 451, 481, 925, 1247, 1681, 1729, 1825, 2059, 2275, 2653, 2821, 3053, 3790, 4745, 4927, 5461, 6175, 6305, 6505, 6601, 7201, 8365, 8911, 9031, 9475, 9730, 9850, 10585, 11041, 12025, 12209, 12403, 13366, 13427, 13747 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Composite numbers n such that 51^(n-1) == 1 (mod n).
LINKS
MATHEMATICA
base = 51; t = {}; n = 1; While[Length[t] < 100, n++; If[! PrimeQ[n] && PowerMod[base, n-1, n] == 1, AppendTo[t, n]]]; t (* T. D. Noe, Feb 21 2012 *)
Select[Range[15000], CompositeQ[#]&&PowerMod[51, #-1, #]==1&] (* Harvey P. Dale, Oct 20 2016 *)
CROSSREFS
Cf. A001567 (pseudoprimes to base 2).
Sequence in context: A163631 A100536 A024838 * A022670 A072277 A283243
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 29 03:41 EDT 2024. Contains 371264 sequences. (Running on oeis4.)