A069714 Least integer k such that (sigma(k)-k)/(k-phi(k)) = n.

2, 12, 1320, 851760

Offset

1,1

Comments

10^11 < a(5) <= 124176229632000. - Donovan Johnson, Oct 22 2011

Links

Table of n, a(n) for n=1..4.

Formula

a(n) = Min{x: A001065(x) / A051953(x) = n}.

Crossrefs

Cf. A068414, A068418, A001065, A051953, A000010, A000203.

Sequence in context: A022482 A372198 A081701 * A176391 A123743 A111180

Adjacent sequences: A069711 A069712 A069713 * A069715 A069716 A069717

Keyword

more,nonn

Author

Labos Elemer, Apr 02 2002

Status

approved