A064251 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,29.

1608, 9090, 13440, 18660, 25620, 41280, 48588, 54678, 59028, 69990, 72948, 73470, 88260, 112620, 135588, 144288, 152640, 170388, 197358, 204318, 225720, 233550, 245208, 264870, 302628, 337080, 361440, 371358, 380058, 386148, 403548, 433650, 440958, 446178, 463230

Offset: 1

Author

N. J. A. Sloane, Sep 23 2001

Keywords

• nonn

Comments

am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(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

Crossrefs

Cf. A087788.

Programs

Mathematica

carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 29}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* Amiram Eldar, Oct 17 2019 *)

Extensions

Offset corrected and more terms added by Amiram Eldar, Oct 17 2019