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 A272594 Numbers n such that the multiplicative group modulo n is the direct product of 4 cyclic groups. 9

%I

%S 120,168,240,264,280,312,336,360,408,420,440,456,480,504,520,528,552,

%T 560,600,616,624,660,672,680,696,720,728,744,760,780,792,816,880,888,

%U 912,920,924,936,952,960,984,1008,1020,1032,1040,1056,1064,1080,1092,1104,1120,1128,1140,1144,1155,1160,1176,1200

%N Numbers n such that the multiplicative group modulo n is the direct product of 4 cyclic groups.

%C Numbers n such that A046072(n) = 4.

%o (PARI) for(n=1, 3*10^3, my(t=#(znstar(n)[2])); if(t==4, print1(n, ", ")));

%Y Direct product of k groups: A033948 (k=1), A272593 (k=2), A272593 (k=3), A272595 (k=5), A272596 (k=6), A272597 (k=7), A272598 (k=8), A272599 (k=9).

%K nonn

%O 1,1

%A _Joerg Arndt_, May 05 2016

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Last modified September 25 06:32 EDT 2020. Contains 337335 sequences. (Running on oeis4.)