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 A099833 Perimeters of Pythagorean triangles that can be constructed in exactly 4 different ways. 2
 240, 360, 480, 504, 630, 672, 756, 780, 900, 960, 990, 1020, 1092, 1140, 1170, 1188, 1344, 1386, 1400, 1428, 1530, 1540, 1596, 1638, 1820, 1920, 1932, 1950, 2070, 2112, 2240, 2244, 2268, 2376, 2380, 2448, 2496, 2508, 2610, 2652, 2660, 2688, 2736, 2800 (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. EXAMPLE a(1)=240 = 15+112+113 = 40+96+104 = 48+90+102 = 60+80+100; a(2)=360 = 36+160+164 = 60+144+156 = 72+135+153 = 90+120+150. CROSSREFS Cf. A098714, A099381, A099382, A156687. Sequence in context: A257413 A030638 A179644 * A272950 A255266 A179440 Adjacent sequences:  A099830 A099831 A099832 * A099834 A099835 A099836 KEYWORD nonn AUTHOR Hugo Pfoertner, Oct 27 2004 STATUS approved

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Last modified August 8 04:32 EDT 2020. Contains 336290 sequences. (Running on oeis4.)