A099833 - OEIS

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

(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)=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.