A105591 - OEIS

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A105591

a(n)=n+2-sum{k=0..n, -mu(k-mod(k^5,5k))}

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 19, 19, 19

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,11

COMMENTS

A Moebius quintuple count.

Numbers appear in quintuples or multiples of quintuples.

LINKS

Table of n, a(n) for n=0..82.

CROSSREFS

Sequence in context: A213809 A204854 A113215 * A130497 A178154 A270774

Adjacent sequences: A105588 A105589 A105590 * A105592 A105593 A105594

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Apr 14 2005

STATUS

approved