A105592 a(n)=n+2-sum{k=0..n, -mu(k-mod(k^7,7k))}

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14

Offset

0,15

Comments

A Moebius septuple count.

Numbers appear in septuples or multiples of septuples.

Links

Table of n, a(n) for n=0..87.

Crossrefs

Sequence in context: A115787 A300959 A259581 * A210745 A187471 A083565

Adjacent sequences: A105589 A105590 A105591 * A105593 A105594 A105595

Keyword

easy,nonn

Author

Paul Barry, Apr 14 2005

Status

approved