Numbers that are the sum of two 4th powers in more than one way (primitive solutions).
635318657, 3262811042, 8657437697, 68899596497, 86409838577, 160961094577
1 seqfan posts
Tue Mar 6 05:49:05 CET 2012 [seqfan] A088867 and A003824: solutions to a^4+b^4=c^4+d^4