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A020211 Pseudoprimes to base 83. 1
21, 65, 82, 105, 123, 133, 205, 231, 265, 273, 287, 451, 533, 561, 689, 697, 703, 861, 1001, 1105, 1113, 1241, 1365, 1558, 1729, 1785, 1891, 2173, 2465, 2569, 2665, 2821, 2993, 3034, 3277, 3445, 4081, 4305, 4411, 4505, 4641, 4745, 5565, 5713, 6541, 6601 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Composite numbers n such that 83^(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 = 83; 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: A041860 A041864 A041866 * A014641 A259677 A089115

Adjacent sequences:  A020208 A020209 A020210 * A020212 A020213 A020214

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified June 5 15:37 EDT 2020. Contains 334852 sequences. (Running on oeis4.)