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A064256
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Numbers m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,39.
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1
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3528, 4620, 8208, 13668, 21858, 24978, 26538, 29268, 30828, 33870, 34260, 34728, 44088, 51030, 58128, 58440, 61560, 72948, 79578, 80670, 95568, 107580, 109608, 112338, 118188, 118890, 124350, 126690, 142758, 144708, 148530, 176220, 191898, 196578, 198528, 208590
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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, 39}*# + 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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