OFFSET

1,2

COMMENTS

a(n) >= 3 for n > 1: (1, ..., 1, 2, 2*(n+1)); (1, ..., 1, (n+1), 2*(n+1)) and (1, ..., 1, 2, n+1, 2*(n+1)) are always solutions.

EXAMPLE

For n=2, there are 3 solutions:

(1, 2, 6) is a solution since 6 / (2 * 1) = 3 = 6 - 2 - 1;

(1, 3, 6) is a solution since 6 / (3 * 1) = 2 = 6 - 3 - 1;

(2, 3, 6) is a solution since 6 / (3 * 2) = 1 = 6 - 3 - 2.

CROSSREFS

KEYWORD

nonn,more

AUTHOR

Reiner Moewald, Apr 18 2017

STATUS

approved