id:A020479 - OEIS Search Results

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A020479

Number of noninvertible 2 X 2 matrices over Z/nZ (determinant is a divisor of 0).

+0
2

10, 33, 160, 145, 1008, 385, 2560, 2673, 7120, 1441, 16128, 2353, 26320, 27585, 40960, 5185, 81648, 7201, 113920, 97713, 155056, 12673, 258048, 90625, 299728, 216513, 421120, 25201, 671760, 30721, 655360, 552321, 866320, 532945, 1306368, 51985 (list; graph; listen)

	OFFSET	`2,1`
	FORMULA	`a(n) seems to be divisible by n. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Sep 01 2003` `a(n)=n^4-A000252(n). - T. D. Noe (noe(AT)sspectra.com), Jan 16 2006`
	CROSSREFS	`Sequence in context: A020478 A094170 A004638 this_sequence A045087 A119086 A002601` `Adjacent sequences: A020476 A020477 A020478 this_sequence A020480 A020481 A020482`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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