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A064242 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,11. 1
378, 576, 1236, 3018, 7506, 9090, 18396, 26250, 27966, 28098, 28428, 31068, 32190, 32586, 34500, 35490, 40506, 42156, 46446, 47700, 48888, 50670, 53376, 55290, 55818, 58788, 65256, 65718, 68226, 73308, 74760, 75618, 77730, 86178 (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
CarmichaelNbrQ[n_] := ! PrimeQ@ n && Mod[n, CarmichaelLambda@ n] == 1; Select[ Range@ 88000, PrimeQ[# + 1] && PrimeQ[2# + 1] && PrimeQ[11# + 1] && CarmichaelNbrQ[(# + 1)(2# + 1)(11# + 1)] &] (* Robert G. Wilson v, Aug 23 2012 *)
CROSSREFS
Cf. A087788.
Sequence in context: A134602 A268373 A030029 * A116339 A225440 A098840
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 23 2001
EXTENSIONS
Offset corrected by Amiram Eldar, Oct 16 2019
STATUS
approved

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Last modified May 21 08:56 EDT 2024. Contains 372733 sequences. (Running on oeis4.)