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A020200 Pseudoprimes to base 72. 1
85, 305, 365, 451, 511, 781, 793, 949, 1037, 1105, 1241, 1387, 1541, 1729, 2465, 2485, 2501, 2701, 2821, 2911, 4381, 4411, 4453, 5183, 5185, 5257, 6205, 6601, 6697, 8449, 8911, 9061, 10585, 11305, 13213, 13981, 14111, 15841, 16441, 17803, 18721, 19345 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Composite numbers n such that 72^(n-1) == 1 (mod n). - Michel Lagneau, Feb 18 2012

LINKS

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

Index entries for sequences related to pseudoprimes

MATHEMATICA

base = 72; 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: A045129 A045105 A038472 * A020298 A183652 A183644

Adjacent sequences:  A020197 A020198 A020199 * A020201 A020202 A020203

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 17 06:41 EDT 2022. Contains 353730 sequences. (Running on oeis4.)