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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.
0
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
1,1
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.
Sequence in context: A297278 A296748 A270042 * A048125 A163482 A257782
KEYWORD
nonn,fini,full
AUTHOR
Hugo Pfoertner, Mar 02 2020
STATUS
approved