OFFSET
1,2
COMMENTS
Numbers n with record numbers of ordered triples {a, b, c} such that a*b = c*n with c < a < b < n.
EXAMPLE
There are 4 unordered triples {a, b, c} of distinct positive integers from 1 to 10 such that a*b = c*10:
{2, 5, 1}: 2*5 = 1*10 = 10;
{4, 5, 2}: 4*5 = 2*10 = 20;
{5, 6, 3}: 5*6 = 3*10 = 30;
{5, 8, 4}: 5*8 = 4*10 = 40.
This is more than any n < 10, so 10 is in this sequence.
CROSSREFS
KEYWORD
nonn
AUTHOR
Bobby Jacobs and Robert G. Wilson v, Sep 30 2017
STATUS
approved