A332924 6*a(n) are the perimeters of distinct triangles with integer sides i <= j <= k, whose area equals 4 times their perimeter. Terms occurring more than once belong to different triangles.

14, 15, 16, 18, 19, 20, 22, 24, 26, 28, 28, 30, 35, 35, 35, 40, 44, 49, 50, 51, 54, 66, 70, 81, 86, 87, 91, 97, 105, 114, 119, 119, 135, 154, 185, 187, 204, 219, 275, 322, 385, 390, 391, 737, 1430

Offset: 1

Author

Hugo Pfoertner, Mar 02 2020

Keywords

• nonn
• fini
• full

Comments

There are 45 integer-sided triangles with 4*area = perimeter, with terms 28 and 119 corresponding to pairs, and terms 35 to a triple of such triangles with different sides.

Crossrefs

The 41 terms of A289220, divided by 24, are all terms of this sequence, but omitting distinct triangles with identical perimeters.