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A020151 Pseudoprimes to base 23. 2
22, 33, 91, 154, 165, 169, 265, 341, 385, 451, 481, 553, 561, 638, 946, 1027, 1045, 1065, 1105, 1183, 1271, 1729, 1738, 1749, 2059, 2321, 2465, 2501, 2701, 2821, 2926, 3097, 3445, 4033, 4081, 4345, 4371, 4681, 5005, 5149, 6253, 6369, 6533, 6541, 7189, 7267 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Composite numbers n such that 23^(n-1) == 1 (mod n).
LINKS
MATHEMATICA
base = 23; 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 *)
CROSSREFS
Cf. A001567 (pseudoprimes to base 2).
Sequence in context: A067087 A155709 A095044 * A071265 A213974 A103320
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified February 27 10:59 EST 2024. Contains 370378 sequences. (Running on oeis4.)