A319185 Numbers that are sums of consecutive hexagonal numbers (A000384).

0, 1, 6, 7, 15, 21, 22, 28, 43, 45, 49, 50, 66, 73, 88, 91, 94, 95, 111, 120, 139, 153, 154, 157, 160, 161, 190, 202, 211, 230, 231, 245, 251, 252, 273, 276, 277, 322, 325, 343, 350, 364, 365, 371, 372, 378, 421, 430, 435, 463, 475, 496, 503, 507, 518, 524, 525, 554, 561

Offset: 1

Author

Ilya Gutkovskiy, Dec 21 2018

Keywords

• nonn

Links

• Eric Weisstein's World of Mathematics, Hexagonal Number

Crossrefs

Cf. A000384, A002412, A034705, A034706, A319184, A322636, A322637.

Programs

Mathematica

anmax = 1000; nmax = Floor[Sqrt[anmax/2]] + 1; Select[Union[Flatten[Table[Sum[k*(2*k-1), {k, i, j}], {i, 0, nmax}, {j, i, nmax}]]], # <= anmax &] (* Vaclav Kotesovec, Dec 21 2018 *)