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%I #22 Sep 29 2024 03:05:43
%S 15,35,45,55,63,65,75,77,85,91,99,105,117,119,135,143,153,161,165,171,
%T 175,187,189,195,203,207,209,221,225,231,245,247,255,259,261,273,275,
%U 285,297,299,315,319,323,325,333,341,345,351,357,369,375,377,385,387,391
%N Odd numbers k such that A091908(k) < 3*(k-1)^2.
%C These are the odd numbers k such that A331423(k) != 0.
%C If k is even then always A091908(k) < 3*(k-1)^2.
%H Jim Propp and Adam Propp-Gubin, <a href="https://arxiv.org/abs/2409.17117">Counting Triangles in Triangles</a>, arXiv:2409.17117 [math.CO], 2024. See p. 9.
%Y Cf. A091908, A331423.
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Feb 14 2020
%E More terms from _Jinyuan Wang_, Feb 17 2020