A020221 - OEIS

A020221

Pseudoprimes to base 93.

4, 25, 28, 46, 92, 301, 322, 325, 425, 506, 532, 793, 805, 865, 874, 1081, 1105, 1393, 1525, 1645, 1729, 1771, 2047, 2071, 2425, 2465, 2737, 2926, 3781, 3913, 4033, 4187, 4325, 4465, 4945, 4996, 5071, 5149, 5185, 5405, 5593, 5713, 5833, 6601, 6697, 6721

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OFFSET

1,1

COMMENTS

Composite numbers n such that 93^(n-1) == 1 (mod n).

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

Index entries for sequences related to pseudoprimes

MATHEMATICA

base = 93; 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).