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A020152 Pseudoprimes to base 24. 1
25, 115, 175, 325, 553, 575, 805, 949, 1105, 1541, 1729, 1771, 1825, 1975, 2413, 2425, 2465, 2701, 2737, 2821, 2885, 3781, 4207, 4537, 6601, 6931, 6943, 7081, 7189, 7471, 7501, 7813, 8725, 8911, 9085, 9361, 9809, 10465, 10585, 11557, 12025, 13825, 14425 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Composite numbers n such that 24^(n-1) == 1 (mod n). - Michel Lagneau, Feb 18 2012
LINKS
MATHEMATICA
base = 24; 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[24, #-1, #]==1&] (* Harvey P. Dale, Jun 30 2023 *)
CROSSREFS
Cf. A001567 (pseudoprimes to base 2).
Sequence in context: A050589 A340123 A247683 * A218493 A360511 A124953
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified April 22 14:33 EDT 2024. Contains 371905 sequences. (Running on oeis4.)