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A274567
Least number k such that k^2-1 is the sum of two nonzero squares in exactly n ways.
2
3, 81, 51, 291, 1251, 339, 62499, 1971, 5201, 5001, 175781251, 7299
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.
KEYWORD
nonn,more
AUTHOR
Altug Alkan, Jun 28 2016
EXTENSIONS
a(10) from Chai Wah Wu, Jul 22 2020
STATUS
approved