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A274567 Least number k such that k^2-1 is the sum of two nonzero squares in exactly n ways. 0
3, 81, 51, 291, 1251, 339, 62499, 1971, 5201 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

a(2) = 81 because 81^2 - 1 = 28^2 + 76^2 = 44^2 + 68^2.

CROSSREFS

Cf. A000404, A005563, A016032, A050795, A050797.

Sequence in context: A183265 A233124 A251694 * A137994 A074386 A116009

Adjacent sequences:  A274564 A274565 A274566 * A274568 A274569 A274570

KEYWORD

nonn,more

AUTHOR

Altug Alkan, Jun 28 2016

STATUS

approved

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Last modified October 15 20:04 EDT 2019. Contains 328037 sequences. (Running on oeis4.)