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A064260 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,47. 1

%I

%S 210,2466,4158,5850,14028,116958,156156,166026,176178,188868,208608,

%T 225528,232860,241320,252036,284748,290106,290670,345378,350736,

%U 399240,439566,444078,448308,450000,498786,582540,669678,708030,722976,746100,809268,813216,860028

%N Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,47.

%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="/A064260/b064260.txt">Table of n, a(n) for n = 1..10000</a>

%t carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 47}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* _Amiram Eldar_, Oct 17 2019 *)

%Y Cf. A087788.

%K nonn

%O 1,1

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

%E Offset corrected and more terms added by _Amiram Eldar_, Oct 17 2019

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Last modified August 10 13:12 EDT 2022. Contains 356039 sequences. (Running on oeis4.)