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A071325 Number of squares > 1 dividing n. 6
0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 2, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 2, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 3, 0, 0, 0, 1, 0, 0, 0, 3, 0, 0, 1, 1, 0, 0, 0, 2, 2, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,16

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..1000

Index entries for sequences computed from exponents in factorization of n

FORMULA

a(n) = A046951(n) - 1.

A057427(a(n)) = 1 - A008966(n).

G.f.: Sum_{k>=2} x^(k^2)/(1 - x^(k^2)). - Ilya Gutkovskiy, Jan 04 2017

PROG

(PARI) a(n) = sumdiv(n, d, issquare(d) && (d>1)); \\ Michel Marcus, Jan 04 2017

CROSSREFS

Cf. A008966, A046951, A057427.

Sequence in context: A322338 A158971 A121467 * A064727 A112378 A324832

Adjacent sequences:  A071322 A071323 A071324 * A071326 A071327 A071328

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 18 2002

STATUS

approved

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Last modified April 13 01:36 EDT 2021. Contains 342934 sequences. (Running on oeis4.)