A071759 Consider sequence b(m) = | Sum_{k=1..m} mu(k)/k |; sequence gives numerators of record low values of b(m).

1, 1, -1, -1, -1, -8549627883788520181, 774925721037986124275366676266697490065342673242708598

Offset

2,6

Comments

a(4) = (-1) because the initial minimal magnitudes of harmonic series are: 1, 1/2, 1/6, (-1)/30.

Links

Table of n, a(n) for n=2..8.

Prog

(PARI) t = 0; t1 = 1; v = []; for( n = 1, 200, t = t + mu( n) / n; if( ( t / t1)^2 < 1, t1 = t; v = concat( v, numer( t)), )); v

Crossrefs

Cf. A071760.

Sequence in context: A213529 A187714 A222534 * A364363 A215876 A095435

Adjacent sequences: A071756 A071757 A071758 * A071760 A071761 A071762

Keyword

sign,frac

Author

Donald S. McDonald, May 18 2002

Status

approved