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

2, 12, 1320, 851760

Offset: 1

Author

Labos Elemer, Apr 02 2002

Keywords

• more
• nonn

Comments

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

Crossrefs

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

Formula

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