A309424 Sum x+y of generator pairs (x, y) {x and y coprime and not both odd} of primitive Pythagorean triangles, sorted by x and y (for same x).

3, 5, 5, 7, 7, 9, 7, 11, 9, 11, 13, 9, 11, 13, 15, 11, 13, 17, 11, 13, 17, 19, 13, 15, 17, 19, 21, 13, 17, 19, 23, 15, 17, 19, 21, 23, 25, 15, 17, 19, 23, 25, 27, 17, 19, 23, 29, 17, 19, 21, 23, 25, 27, 29, 31, 19, 21, 23, 25, 27, 29, 31, 33, 19, 23, 25, 29, 31, 35, 21, 23, 25, 27, 29, 31, 33, 35, 37, 21, 23, 27, 29, 31, 33, 37, 39

Offset: 1

Author

Rui Lin, Jul 31 2019

Keywords

• nonn

Comments

This sequence is based on x and y (for same x) in increasing order, directly mapping to A094192 and A094193, while A126611 is sorted by the sum x+y.

Given any 2 of below 4 sequences, primitive Pythagorean triangles can be generated.

A094192: the bigger one in generator pairs;

A094193: the smaller one in generator pairs;

A309424: the sum of generator pairs;

A309425: the difference of generator pairs.

Crossrefs

Cf. A094192, A094193, A126611, A309425.

Formula

a(n) = A094192(n) + A094193(n).