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 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). 2
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 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. LINKS FORMULA a(n) = A094192(n) + A094193(n). CROSSREFS Cf. A094192, A094193, A126611, A309425. Sequence in context: A103332 A195796 A279944 * A079886 A338363 A346563 Adjacent sequences: A309421 A309422 A309423 * A309425 A309426 A309427 KEYWORD nonn AUTHOR Rui Lin, Jul 31 2019 STATUS approved

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Last modified March 22 22:37 EDT 2023. Contains 361434 sequences. (Running on oeis4.)