OFFSET
1,1
COMMENTS
There are no more terms through 10^11. It seems extremely unlikely that any more terms exist.
Every odd square is a number of the form 8*k + 1, so every sum of four odd squares is a number of the form 8*k + 4.
A316834 lists all numbers that can be expressed in only one way as the sum of four distinct odd squares.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jon E. Schoenfield, Jul 27 2018
STATUS
approved