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A064258 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,43. 1

%I #10 Oct 17 2019 05:58:54

%S 966,12576,36570,37860,71916,78366,103650,126096,132546,242970,279606,

%T 316500,387966,392610,404220,407316,418926,459690,498390,500196,

%U 523416,524706,554376,604170,707886,729300,749940,755616,769806,840756,897516,903450,974400,1048446

%N Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,43.

%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="/A064258/b064258.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, 43}*# + 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 April 24 19:56 EDT 2024. Contains 371963 sequences. (Running on oeis4.)