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A337134 a(n) = Sum_{k=1..n} floor(sqrt(2k-1)). 0
1, 2, 4, 6, 9, 12, 15, 18, 22, 26, 30, 34, 39, 44, 49, 54, 59, 64, 70, 76, 82, 88, 94, 100, 107, 114, 121, 128, 135, 142, 149, 156, 164, 172, 180, 188, 196, 204, 212, 220, 229, 238, 247, 256, 265, 274, 283, 292, 301, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 421, 432 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Partial sums of A103128.

LINKS

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

MATHEMATICA

Table[Sum[Floor[Sqrt[2 i - 1]], {i, n}], {n, 100}]

PROG

(PARI) a(n) = sum(k=1, n, sqrtint(2*k-1)); \\ Michel Marcus, Aug 18 2020

CROSSREFS

Cf. A103128.

Sequence in context: A296349 A325544 A118103 * A185601 A157795 A294060

Adjacent sequences:  A337131 A337132 A337133 * A337135 A337136 A337137

KEYWORD

nonn,easy

AUTHOR

Wesley Ivan Hurt, Aug 18 2020

STATUS

approved

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Last modified September 20 12:05 EDT 2021. Contains 347586 sequences. (Running on oeis4.)