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 A064250 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,27. 1

%I

%S 606,2280,3036,3738,7950,15348,16266,20640,21558,23826,26040,27066,

%T 28686,30576,31386,31656,32358,33870,36570,47856,49476,53148,57036,

%U 64920,65028,70536,72480,80526,85818,86466,92568,94350,96996,102828

%N Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,27.

%C am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1).

%D Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001.

%H Amiram Eldar, <a href="/A064250/b064250.txt">Table of n, a(n) for n = 1..10000</a>

%t CarmichaelNbrQ[n_] := ! PrimeQ@ n && Mod[n, CarmichaelLambda@ n] == 1; Select[ Range@ 105000, PrimeQ[# + 1] && PrimeQ[2# + 1] && PrimeQ[27# + 1] && CarmichaelNbrQ[(# + 1)(2# + 1)(27# + 1)] &] (* _Robert G. Wilson v_, Aug 23 2012 *)

%Y Cf. A087788.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Sep 23 2001

%E Offset corrected by _Amiram Eldar_, Oct 17 2019

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Last modified January 23 03:15 EST 2022. Contains 350504 sequences. (Running on oeis4.)