1,1

These are pairs of terms of A009111 differing by 6 -- the least amount possible. Mohanty and Mohanty call these twin Pythagorean numbers. In Theorem 9, they prove that there are an infinite number of these numbers.

Table of n, a(n) for n=1..44.

Supriya Mohanty and S. P. Mohanty, Pythagorean Numbers, Fibonacci Quarterly 28 (1990), 31-42.

Cf. A009111 (Pythagorean numbers).

Cf. A228876, A228877 (upper and lower Pythagorean twins).

Sequence in context: A125640 A141545 A106682 * A175258 A135045 A109321

Adjacent sequences: A228872 A228873 A228874 * A228876 A228877 A228878

nonn

T. D. Noe, Sep 24 2013

approved