

A194179


[sum{(k*r) : 1<=k<=n}], where [ ]=floor, ( )=fractional part, and r=1/2+sqrt(8).


2



0, 0, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 8, 9, 9, 10, 11, 11, 11, 12, 13, 13, 14, 14, 15, 16, 16, 16, 17, 17, 18, 19, 19, 19, 20, 20, 21, 22, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 26, 27, 27, 27, 28, 28, 29, 29, 29, 30, 31, 31, 31, 32, 32, 32, 33, 33, 33, 34, 35, 35, 36
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OFFSET

1,4


LINKS

Table of n, a(n) for n=1..72.


MATHEMATICA

r = 1/2+Sqrt[8];
a[n_] := Floor[Sum[FractionalPart[k*r], {k, 1, n}]]
Table[a[n], {n, 1, 90}] (* A194179 *)
s[n_] := Sum[a[k], {k, 1, n}]
Table[s[n], {n, 1, 100}] (* A194180 *)


CROSSREFS

Cf. A194180.
Sequence in context: A076370 A112318 A078489 * A101803 A005379 A029922
Adjacent sequences: A194176 A194177 A194178 * A194180 A194181 A194182


KEYWORD

nonn


AUTHOR

Clark Kimberling, Aug 18 2011


STATUS

approved



