OFFSET
1,1
COMMENTS
In other words, numbers n such that n^2 - 1 is the sum of two nonzero distinct squares in exactly one way. This explains why there are many common terms between this sequence and A050797.
EXAMPLE
9 is a term because 9^2 - 1 = (4^2 + 12^2) / 2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Altug Alkan, Jun 29 2016
STATUS
approved