A332378 Odd numbers k such that A091908(k) < 3*(k-1)^2.

15, 35, 45, 55, 63, 65, 75, 77, 85, 91, 99, 105, 117, 119, 135, 143, 153, 161, 165, 171, 175, 187, 189, 195, 203, 207, 209, 221, 225, 231, 245, 247, 255, 259, 261, 273, 275, 285, 297, 299, 315, 319, 323, 325, 333, 341, 345, 351, 357, 369, 375, 377, 385, 387, 391

Offset

1,1

Comments

These are the odd numbers k such that A331423(k) != 0.

If k is even then always A091908(k) < 3*(k-1)^2.

Links

Table of n, a(n) for n=1..55.

Jim Propp and Adam Propp-Gubin, Counting Triangles in Triangles, arXiv:2409.17117 [math.CO], 2024. See p. 9.

Crossrefs

Cf. A091908, A331423.

Sequence in context: A233561 A114988 A130871 * A376333 A244969 A090196

Adjacent sequences: A332375 A332376 A332377 * A332379 A332380 A332381

Keyword

nonn

Author

N. J. A. Sloane, Feb 14 2020

Extensions

More terms from Jinyuan Wang, Feb 17 2020

Status

approved