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A272594 Numbers n such that the multiplicative group modulo n is the direct product of 4 cyclic groups. 9
120, 168, 240, 264, 280, 312, 336, 360, 408, 420, 440, 456, 480, 504, 520, 528, 552, 560, 600, 616, 624, 660, 672, 680, 696, 720, 728, 744, 760, 780, 792, 816, 880, 888, 912, 920, 924, 936, 952, 960, 984, 1008, 1020, 1032, 1040, 1056, 1064, 1080, 1092, 1104, 1120, 1128, 1140, 1144, 1155, 1160, 1176, 1200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers n such that A046072(n) = 4.

LINKS

Table of n, a(n) for n=1..58.

PROG

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

CROSSREFS

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).

Sequence in context: A099832 A111399 A030634 * A189975 A232461 A090782

Adjacent sequences:  A272591 A272592 A272593 * A272595 A272596 A272597

KEYWORD

nonn

AUTHOR

Joerg Arndt, May 05 2016

STATUS

approved

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Last modified August 9 21:21 EDT 2020. Contains 336326 sequences. (Running on oeis4.)