A064253 Values of n such that N=(an+1)(bn+1)(cn+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,33.

576, 1170, 2556, 6120, 20706, 23676, 29220, 29286, 32586, 39450, 46380, 46446, 50076, 52386, 58920, 63210, 65256, 65850, 69876, 74100, 77796, 93240, 107826, 113370, 114030, 116340, 127296, 128220, 129606, 130530, 140826, 141156, 149340, 170196, 174090, 177126, 178446

Offset

1,1

Comments

an+1, bn+1, cn+1 are primes and an | (N-1), bn | (N-1), cn |(N-1).

References

Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001.

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Mathematica

carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 33}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* Amiram Eldar, Oct 17 2019 *)

Crossrefs

Cf. A087788.

Sequence in context: A250775 A109101 A258919 * A069266 A060678 A254848

Adjacent sequences: A064250 A064251 A064252 * A064254 A064255 A064256

Keyword

nonn

Author

N. J. A. Sloane, Sep 23 2001

Extensions

More terms from Amiram Eldar, Oct 17 2019

Status

approved