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A234952 Apply the map k -> L(k)/gcd(L(k),k-1) to the sequence A007850 of Giuga numbers, where L(k) is the Carmichael lambda function A002322. 0

%I

%S 4,60,120,2320,1552848,10080,139714902540,93294624780,228657996794220,

%T 4756736241732916394976,20024071474861042488900,

%U 2176937111336664570375832140,15366743578393906356665002406454800354974137359272445859047945613961394951904884493965220

%N Apply the map k -> L(k)/gcd(L(k),k-1) to the sequence A007850 of Giuga numbers, where L(k) is the Carmichael lambda function A002322.

%H J. M. Grau and A. M. Oller-Marcén, <a href="http://arxiv.org/abs/1311.3522">On the congruence sum_{j=1}^{n-1} j^{k(n-1)} == -1 (mod n); k-strong Giuga and k-Carmichael numbers</a>, arXiv preprint arXiv:1311.3522, 2013

%Y Cf. A007850, A002322.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Jan 12 2014

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Last modified December 12 07:58 EST 2018. Contains 318053 sequences. (Running on oeis4.)