A025218 a(n) = floor( Sum_{k=1..n} sqrt(k+1) ).

1, 3, 5, 7, 9, 12, 15, 18, 21, 24, 28, 31, 35, 39, 43, 47, 51, 56, 60, 65, 69, 74, 79, 84, 89, 94, 100, 105, 111, 116, 122, 128, 133, 139, 145, 151, 158, 164, 170, 177, 183, 190, 196, 203, 210, 217, 223, 230, 238, 245, 252, 259, 267, 274, 281, 289, 297, 304, 312, 320, 328, 336

Offset

1,2

Links

Table of n, a(n) for n=1..62.

Mathematica

Table[Floor[Sum[Sqrt[k + 1], {k, n}]], {n, 80}] (* Wesley Ivan Hurt, Oct 30 2022 *)

Prog

(PARI) a(n) = floor(sum(k=1, n, sqrt(k+1))) \\ Michel Marcus, Mar 24 2013

Crossrefs

Sequence in context: A362135 A204206 A080751 * A258782 A349993 A007078

Adjacent sequences: A025215 A025216 A025217 * A025219 A025220 A025221

Keyword

nonn

Author

Clark Kimberling

Status

approved