A000190 - OEIS

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A000190

Number of solutions to x^4 == 0 (mod n).

1, 1, 1, 2, 1, 1, 1, 4, 3, 1, 1, 2, 1, 1, 1, 8, 1, 3, 1, 2, 1, 1, 1, 4, 5, 1, 9, 2, 1, 1, 1, 8, 1, 1, 1, 6, 1, 1, 1, 4, 1, 1, 1, 2, 3, 1, 1, 8, 7, 5, 1, 2, 1, 9, 1, 4, 1, 1, 1, 2, 1, 1, 3, 16, 1, 1, 1, 2, 1, 1, 1, 12, 1, 1, 5, 2, 1, 1, 1, 8, 27, 1, 1, 2, 1, 1, 1, 4, 1, 3 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000` `H. Bottomley, Some Smarandache-type multiplicative sequences`
	FORMULA	`Multiplicative with a(p^e) = p^[3e/4]. - David W. Wilson (davidwwilson(AT)comcast.net), Aug 01, 2001.`
	MATHEMATICA	`Array[ Function[ n, Count[ Array[ PowerMod[ #, 4, n ]&, n, 0 ], 0 ] ], 100 ]`
	CROSSREFS	`Sequence in context: A125653 A104445 A000189 * A003557 A073752 A128708` `Adjacent sequences: A000187 A000188 A000189 * A000191 A000192 A000193`
	KEYWORD	`nonn,mult`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.