A099833 Perimeters of Pythagorean triangles that can be constructed in exactly 4 different ways.

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

Offset: 1

Author

Hugo Pfoertner, Oct 27 2004

Keywords

• nonn

Examples

			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.
		

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.

Crossrefs

Cf. A098714, A099381, A099382, A156687.