OFFSET
1,1
COMMENTS
a(11) > 25*10^5 if it exists. - Chai Wah Wu, Jul 23 2020
From David A. Corneth, Jul 23 2020: (Start)
a(13) <= 17578125001, a(17) <= 610351562499. (End)
EXAMPLE
a(2) = 81 because 81^2 - 1 = 28^2 + 76^2 = 44^2 + 68^2.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Altug Alkan, Jun 28 2016
EXTENSIONS
a(10) from Chai Wah Wu, Jul 22 2020
STATUS
approved