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A020203 Pseudoprimes to base 75. 1
74, 91, 133, 247, 259, 289, 427, 481, 703, 793, 1073, 1159, 1261, 1387, 1541, 1649, 1729, 1849, 1891, 2071, 2257, 2413, 2701, 2813, 2821, 3367, 3589, 4033, 4681, 4699, 4921, 5551, 5917, 6061, 6533, 6601, 6643, 7957, 8113, 8321, 8614, 8911, 9139, 9211 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Composite numbers n such that 75^(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 = 75; 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: A095569 A305265 A055111 * A295158 A039484 A098516

Adjacent sequences:  A020200 A020201 A020202 * A020204 A020205 A020206

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified January 23 10:50 EST 2020. Contains 331171 sequences. (Running on oeis4.)