A066907 - OEIS

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A066907

Number of elements in GL(2,Z_n) x with x^2 == I mod n where I is the identity matrix.

1, 4, 14, 28, 32, 56, 58, 176, 110, 128, 134, 392, 184 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`a(n) is multiplicative and for an odd prime power p^k : a(p^k) = 2 + p^(k-1)(p+1).`
	FORMULA	`a(n) = A066947(n) + 1`
	CROSSREFS	`Cf. A066947, A060594.` `Sequence in context: A175680 A094320 A200546 * A130439 A033690 A103779` `Adjacent sequences: A066904 A066905 A066906 * A066908 A066909 A066910`
	KEYWORD	`nonn,mult`
	AUTHOR	`Sharon Sela (sharonsela(AT)hotmail.com), Jan 26 2002`

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Last modified February 15 12:25 EST 2012. Contains 205786 sequences.