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A000190 Number of solutions to x^4 == 0 (mod n). 12
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.