1,1

Equable Heronian triangles are triangles with integer-sides, integer area and whose area is equal to their perimeter. There are exactly five, [6,8,10], [5,12,13], [9,10,17], [7,15,20], [6,25,29].

Table of n, a(n) for n=1..5.

Eric Weisstein's World of Mathematics, Heronian Triangle

Wikipedia, Heronian triangle

Wikipedia, Integer Triangle

Cf. A098030 (areas/perimeters), A335013 (middle side lengths), A335015 (smallest side lengths), this sequence (largest side lengths).

Sequence in context: A055984 A282108 A306035 * A240109 A163652 A081642

Adjacent sequences: A335012 A335013 A335015 * A335017 A335018 A335019

nonn,fini,full

Wesley Ivan Hurt, May 19 2020

approved