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 A020883 Ordered long legs of primitive Pythagorean triangles. 44
 4, 12, 15, 21, 24, 35, 40, 45, 55, 56, 60, 63, 72, 77, 80, 84, 91, 99, 105, 112, 117, 120, 132, 140, 143, 144, 153, 156, 165, 168, 171, 176, 180, 187, 195, 208, 209, 220, 221, 224, 231, 240, 247, 252, 253, 255, 260, 264, 272, 273, 275, 285, 288, 299, 304, 308, 312, 323 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Consider primitive Pythagorean triangles (A^2 + B^2 = C^2, (A, B) = 1, A < B); sequence gives values of B, sorted. Any term in this sequence is given by f(m,n) = 2*m*n or g(m,n) = m^2 - n^2 where m and n are any two positive integers, m > 1, n < m, the greatest common divisor of m and n is 1, m and n are not both odd; e.g., f(m,n) = f(2,1) = 2*2*1 = 4. - Agola Kisira Odero, Apr 29 2016 All terms are composite. - Thomas Ordowski, Mar 12 2017 a(1) is the only power of 2. - Torlach Rush, Nov 08 2019 The first term appearing twice is 420 = a(75) = a(76) = A024410(1). - Giovanni Resta, Nov 11 2019 LINKS Giovanni Resta, Table of n, a(n) for n = 1..10000 Ron Knott, Pythagorean Triples and Online Calculators CROSSREFS Cf. A020882, A020884, A020885, A020886, A024354, A024410. Sequence in context: A215011 A024353 A024354 * A002365 A212245 A046087 Adjacent sequences:  A020880 A020881 A020882 * A020884 A020885 A020886 KEYWORD nonn AUTHOR EXTENSIONS Extended and corrected by David W. Wilson STATUS approved

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Last modified August 15 10:51 EDT 2020. Contains 336492 sequences. (Running on oeis4.)