A020227 - OEIS

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A020227

Pseudoprimes to base 99.

14, 25, 35, 49, 65, 98, 145, 169, 175, 217, 245, 325, 361, 377, 637, 703, 725, 742, 775, 833, 845, 1105, 1225, 1421, 1519, 1729, 1834, 1885, 2191, 2198, 2413, 2465, 2821, 3185, 3277, 3565, 4069, 4123, 4225, 4699, 4753, 4795, 4901, 5365, 5425, 5611, 6601

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OFFSET

1,1

COMMENTS

Composite numbers n such that 99^(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 = 99; 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[7000], CompositeQ[#]&&PowerMod[99, #-1, #]==1&] (* Harvey P. Dale, Jul 16 2015 *)

CROSSREFS