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 A099831 Perimeters of Pythagorean triangles that can be constructed in exactly 2 different ways. 2
 60, 84, 90, 132, 144, 210, 264, 270, 288, 300, 312, 330, 390, 408, 432, 440, 450, 456, 462, 468, 510, 520, 546, 552, 570, 576, 588, 612, 616, 680, 684, 690, 700, 728, 760, 770, 800, 810, 816, 828, 870, 910, 912, 918, 920, 952, 1044, 1064, 1100, 1104, 1116 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Ray Chandler, Table of n, a(n) for n = 1..10000 Ron Knott, Pythagorean Triples and Online Calculators Eric Weisstein's World of Mathematics, Pythagorean Triple. Index entries related to Pythagorean Triples. EXAMPLE a(1)=60 = 10+24+26 = 15+20+25; a(2)=84 = 12+35+37 = 21+28+35. CROSSREFS Cf. A098714, A099382, A099383, A156687. Sequence in context: A085987 A356413 A086974 * A306222 A138604 A350140 Adjacent sequences: A099828 A099829 A099830 * A099832 A099833 A099834 KEYWORD nonn AUTHOR Hugo Pfoertner, Oct 27 2004 STATUS approved

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Last modified May 28 08:47 EDT 2023. Contains 362999 sequences. (Running on oeis4.)