A055004 Boris Stechkin's function.

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

Offset: 0

Author

N. J. A. Sloane, Jun 11 2000

Keywords

• nonn

References

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

Links

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

Crossrefs

Cf. A063483.

Programs

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 *)