A349489 a(n) = Sum_{k=1..n} k * floor(sqrt(2*k-1)).

1, 3, 9, 17, 32, 50, 71, 95, 131, 171, 215, 263, 328, 398, 473, 553, 638, 728, 842, 962, 1088, 1220, 1358, 1502, 1677, 1859, 2048, 2244, 2447, 2657, 2874, 3098, 3362, 3634, 3914, 4202, 4498, 4802, 5114, 5434, 5803, 6181, 6568, 6964, 7369, 7783, 8206, 8638, 9079, 9529, 10039

Offset

1,2

Links

Table of n, a(n) for n=1..51.

Mathematica

Table[Sum[k*Floor[Sqrt[2 k - 1]], {k, n}], {n, 80}]

Crossrefs

Cf. A103128, A337134.

Sequence in context: A090262 A190815 A006459 * A049778 A270105 A294425

Adjacent sequences: A349486 A349487 A349488 * A349490 A349491 A349492

Keyword

nonn

Author

Wesley Ivan Hurt, Nov 19 2021

Status

approved