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A020171 Pseudoprimes to base 43. 2
6, 14, 21, 25, 33, 42, 77, 91, 105, 165, 185, 231, 325, 385, 425, 481, 525, 561, 777, 825, 861, 925, 973, 1045, 1105, 1221, 1541, 1729, 1785, 1807, 1825, 1925, 2071, 2425, 2465, 2553, 2821, 2849, 3145, 3281, 3439, 3781, 3885, 4033, 4417, 4825, 5005, 5565, 6105 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Composite numbers n such that 43^(n-1) == 1 (mod n).

LINKS

R. J. Mathar, Table of n, a(n) for n=1..1234

Index entries for sequences related to pseudoprimes

MATHEMATICA

base = 43; 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], !PrimeQ[#]&&PowerMod[43, #-1, #]==1&] (* Harvey P. Dale, Aug 17 2017 *)

CROSSREFS

Cf. A001567 (pseudoprimes to base 2).

Sequence in context: A118129 A046712 A162823 * A122784 A244175 A063299

Adjacent sequences:  A020168 A020169 A020170 * A020172 A020173 A020174

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified July 15 04:34 EDT 2020. Contains 335763 sequences. (Running on oeis4.)