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A087726 Number of elements X in the matrix ring M_2(Z_n) such that X^2 == 0 mod n. +0
1
1, 4, 9, 28, 25, 36, 49, 112, 153, 100 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Cf. A066907, A000188.

Sequence in context: A111962 A071913 A007872 this_sequence A101973 A071258 A120333

Adjacent sequences: A087723 A087724 A087725 this_sequence A087727 A087728 A087729

KEYWORD

mult,nonn

AUTHOR

Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 28 2003

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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