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A076545 sum[k=1 to n] mu(k)+sqf(k): mu(k) is Moebius function; sqf(k)=1 if k is squarefree, sqf(k)=-1 otherwise. 0
2, 2, 2, 1, 1, 3, 3, 2, 1, 3, 3, 2, 2, 4, 6, 5, 5, 4, 4, 3, 5, 7, 7, 6, 5, 7, 6, 5, 5, 5, 5, 4, 6, 8, 10, 9, 9, 11, 13, 12, 12, 12, 12, 11, 10, 12, 12, 11, 10, 9, 11, 10, 10, 9, 11, 10, 12, 14, 14, 13, 13, 15, 14, 13, 15, 15, 15, 14, 16, 16, 16, 15, 15, 17, 16, 15, 17, 17, 17, 16, 15 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..81.

CROSSREFS

Sequence in context: A098593 A144431 A053821 * A162246 A277447 A213126

Adjacent sequences:  A076542 A076543 A076544 * A076546 A076547 A076548

KEYWORD

easy,nonn

AUTHOR

Zak Seidov, Oct 19 2002

STATUS

approved

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Last modified November 15 11:35 EST 2018. Contains 317238 sequences. (Running on oeis4.)