A020165 - OEIS

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A020165

Pseudoprimes to base 37.

4, 6, 9, 12, 18, 28, 36, 45, 57, 66, 133, 171, 217, 246, 268, 285, 301, 396, 451, 469, 561, 589, 685, 801, 817, 1065, 1105, 1233, 1273, 1333, 1387, 1476, 1653, 1729, 1876, 1881, 2044, 2077, 2413, 2465, 2501, 2556, 2706, 2821, 2881, 3556, 3565, 3781, 3913, 4047

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

OFFSET

1,1

COMMENTS

Composite numbers n such that 37^(n-1) == 1 (mod n).

LINKS

R. J. Mathar, Table of n, a(n) for n=1..1119

Index entries for sequences related to pseudoprimes

MATHEMATICA

base = 37; 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).