1,1
Composite numbers n such that 12^(n-1) == 1 (mod n). - Michel Lagneau, Feb 18 2012
T. D. Noe, Table of n, a(n) for n = 1..1000
Index entries for sequences related to pseudoprimes
base = 12; 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 *)
Cf. A001567 (pseudoprimes to base 2).
Sequence in context: A160055 A250642 A280755 * A283656 A020194 A094447
Adjacent sequences: A020137 A020138 A020139 * A020141 A020142 A020143
nonn
David W. Wilson
approved