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A065699 Values of m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,63. 4

%I #7 Oct 17 2019 16:20:27

%S 156,2550,3180,19686,29640,40350,41610,43626,46020,51060,65550,72480,

%T 79536,80670,85836,97176,133716,150096,159420,170760,184116,191550,

%U 214986,229980,255180,262110,278490,279120,293106,294996,301926,337080,350940,369210,370596

%N Values of m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,63.

%H Amiram Eldar, <a href="/A065699/b065699.txt">Table of n, a(n) for n = 1..10000</a>

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

%t carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 63}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* _Amiram Eldar_, Oct 17 2019 *)

%Y Cf. A064238-A064262, A065695-A065703, A087788.

%K nonn

%O 1,1

%A Harvey Dubner (harvey(AT)dubner.com), Nov 14 2001

%E More terms from _Amiram Eldar_, Oct 17 2019

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)