1,1

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

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

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

Sequence in context: A183265 A233124 A251694 * A137994 A074386 A116009

Adjacent sequences: A274564 A274565 A274566 * A274568 A274569 A274570

nonn,more

Altug Alkan, Jun 28 2016

approved