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A066541 Number of normal subgroups of the group GL(2,Z_n) of invertible 2 X 2 matrices mod n (sequence A000252). +0
1
1, 3, 5, 12, 6, 17, 8, 46, 14, 22, 8, 82, 12, 28, 38 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Cf. A066514.

Sequence in context: A038198 A079037 A101315 this_sequence A087122 A037221 A080560

Adjacent sequences: A066538 A066539 A066540 this_sequence A066542 A066543 A066544

KEYWORD

nonn

AUTHOR

Sharon Sela (sharonsela(AT)hotmail.com), Jan 07 2002

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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