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

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