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A064257 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,41. 1
306, 7686, 9900, 24168, 32778, 68448, 86160, 107070, 112236, 148398, 172998, 207930, 217770, 221706, 231546, 250488, 277548, 292800, 303378, 306576, 329208, 354300, 380130, 398580, 488616, 490338, 492798, 501408, 533388, 559218, 567828, 605220, 619980, 640890 (list; graph; refs; listen; history; text; internal format)
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
MATHEMATICA
carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 41}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* Amiram Eldar, Oct 17 2019 *)
CROSSREFS
Cf. A087788.
Sequence in context: A206679 A172966 A223073 * A221854 A221724 A023908
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

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Last modified June 24 01:53 EDT 2024. Contains 373661 sequences. (Running on oeis4.)