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A131703 a(n) = Sum_{k=1..floor(sqrt(n))} floor(k*sqrt(n)). 0
1, 1, 1, 6, 6, 6, 7, 7, 18, 18, 18, 19, 20, 21, 21, 40, 40, 40, 42, 42, 44, 45, 46, 46, 75, 75, 75, 77, 78, 79, 81, 82, 83, 85, 85, 126, 126, 126, 128, 129, 132, 132, 135, 136, 138, 139, 141, 141, 196, 196, 196, 199, 200, 203, 204, 205, 208, 210, 212, 213, 215, 217, 217 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..63.

MATHEMATICA

Table[Sum[Floor[k*Sqrt[n]], {k, 1, Floor[Sqrt[n]]}], {n, 1, 75}] (* Stefan Steinerberger, Sep 18 2007 *)

CROSSREFS

Sequence in context: A195504 A098537 A276861 * A329087 A135357 A322346

Adjacent sequences:  A131700 A131701 A131702 * A131704 A131705 A131706

KEYWORD

nonn

AUTHOR

Leroy Quet, Sep 16 2007

EXTENSIONS

More terms from Stefan Steinerberger, Sep 18 2007

STATUS

approved

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Last modified January 19 14:53 EST 2020. Contains 331049 sequences. (Running on oeis4.)