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A064252
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Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,31.
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1
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13158, 15390, 16878, 25620, 31386, 36036, 60960, 92580, 109320, 110436, 132756, 136848, 177210, 184650, 236916, 247518, 265560, 273186, 278766, 308526, 314850, 317826, 326940, 333450, 338286, 364140, 376416, 389436, 440958, 447840, 451746, 467556, 476298, 494340
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OFFSET
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1,1
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COMMENTS
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am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1).
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REFERENCES
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Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001.
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LINKS
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MATHEMATICA
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carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 31}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* Amiram Eldar, Oct 17 2019 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Offset corrected and more terms added by Amiram Eldar, Oct 17 2019
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STATUS
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approved
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