OFFSET
1,1
COMMENTS
Corresponding triples are (72, 73, 74), (22048, 22049, 22050), (90707200, 90707201, 90707202), (4359888, 4359889, 4359890) for first four terms.
a(6) = 1428907401, a(8) = 2305281745. No more terms < 2*10^11. - Lars Blomberg, Jun 01 2018
a(5) > 10^15, if it exists. - Giovanni Resta, Jun 05 2018
EXAMPLE
a(2) = 22049 because 22048 = 12^2 + 148^2 = 68^2 + 132^2, 22049 = 32^2 + 145^2 = 40^2 + 143^2, 22050 = 21^2 + 147^2 = 105^2 + 105^2.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Altug Alkan, Jun 29 2016
STATUS
approved