There are infinitely many ordered pairs
(m,n) of positive integers for which
m + (m+1) + (m+2) + ... (n1) + n = mn.
List the first five pairs ordered by values of m.
(In reply to
computer solution  first eight pairs by Charlie)
That's about as far as I got: searching quadratic formulas for m that give and integer.
m is given by https://oeis.org/A011900
n is given by https://oeis.org/A001109
each note a recursion relation. I'm trying to prove it.

Posted by Jer
on 20151204 12:50:00 