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A332922
2*a(n) are the perimeters of distinct triangles with integer sides i <= j <= k, whose area equals 2 times their perimeter. Terms occurring more than once belong to different triangles.
1
21, 24, 27, 30, 33, 36, 39, 42, 42, 45, 60, 66, 75, 81, 99, 105, 171, 306
OFFSET
1,1
COMMENTS
There are 18 integer-sided triangles with 2*area = perimeter, with terms 42 corresponding to a pair of such triangles with different sides.
CROSSREFS
Equals A289218/2.
Cf. A289219, A289220, A289221, A332879, A289253 (all merging terms for triangles with identical perimeters, but different sides).
Sequence in context: A302514 A303313 A257642 * A066867 A111356 A344806
KEYWORD
nonn,fini,full
AUTHOR
Hugo Pfoertner, Mar 02 2020
STATUS
approved