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A055004 Boris Stechkin's function. 4
0, 0, 1, 5, 15, 33, 64, 107, 171, 252, 359, 490, 656, 844, 1079, 1346, 1656, 2006, 2415, 2859, 3373, 3927, 4550, 5233, 5993, 6793, 7690, 8653, 9697, 10809, 12028, 13299, 14695, 16158, 17731, 19398, 21174, 23018, 25017, 27108, 29318, 31616 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

R. K. Guy, Unsolved Problems Number Theory, A17.

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

MAPLE

A055004 := proc(n) local m; add((m-1)*floor(n*(m-1)/m), m=2..n); end proc;

MATHEMATICA

Table[Sum[(k - 1)*Floor[n*(k - 1)/k], {k, 2, n}], {n, 0, 100}] (* G. C. Greubel, Jun 06 2016 *)

CROSSREFS

Cf. A063483.

Sequence in context: A228599 A260918 A212983 * A147264 A147150 A279231

Adjacent sequences:  A055001 A055002 A055003 * A055005 A055006 A055007

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 11 2000

STATUS

approved

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Last modified January 22 09:52 EST 2019. Contains 319363 sequences. (Running on oeis4.)