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A020197 Pseudoprimes to base 69. 1
4, 34, 35, 68, 85, 91, 119, 133, 247, 361, 595, 1105, 1387, 1615, 1729, 1921, 2431, 2465, 2527, 2701, 2821, 3605, 3655, 4187, 4693, 4849, 5713, 6161, 6643, 6943, 7345, 7735, 8911, 10349, 10585, 11191, 11305, 11905, 13019, 13357, 14246, 14315, 15181, 15841 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Composite numbers n such that 69^(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 = 69; 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: A225609 A113086 A058153 * A102959 A057959 A220168

Adjacent sequences:  A020194 A020195 A020196 * A020198 A020199 A020200

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified April 26 08:05 EDT 2019. Contains 322472 sequences. (Running on oeis4.)