A070891 Denominator of Sum_{k=1..n} mu(k)/k when it changes sign.

30, 15, 105, 210, 2310, 5005, 1616615, 9699690, 223092870, 111546435, 2156564410, 100280245065, 3710369067405, 7420738134810, 6541380665835015

Offset: 1

Author

Donald S. McDonald, May 17 2002

Keywords

• nonn
• frac

Crossrefs

Cf. A070890, A070888, A070889.

Programs

PARI

t = 0; v = []; for( n = 1, 80, t1 = t; t = t + moebius( n) / n; if( t * t1 < 0, v = concat( v, denominator( t)), )); v