A064251 - OEIS

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

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OFFSET

1,1

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

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 *)

CROSSREFS

Cf. A087788.

Sequence in context: A210364 A224947 A098193 * A238149 A023685 A301938

Adjacent sequences: A064248 A064249 A064250 * A064252 A064253 A064254

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 23 2001

EXTENSIONS

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

STATUS

approved