OFFSET
5,9
LINKS
G. C. Greubel, Table of n, a(n) for n = 5..1000
FORMULA
a(n) = Sum_{j=1..n-8} mod(n-4, floor((n-8)/j)). - G. C. Greubel, Dec 12 2019
MAPLE
seq( add(`mod`(n-4, floor((n-8)/j)), j=1..n-8), n=5..70); # G. C. Greubel, Dec 12 2019
MATHEMATICA
Table[Sum[Mod[n-4, Floor[(n-8)/j]], {j, n-8}], {n, 5, 70}] (* G. C. Greubel, Dec 12 2019 *)
PROG
(PARI) vector(70, n, sum(j=1, n-4, lift(Mod(n, (n-4)\j))) ) \\ G. C. Greubel, Dec 12 2019
(Magma) [ n lt 9 select 0 else &+[((n-4) mod Floor((n-8)/j)): j in [1..n-8]]: n in [5..70]]; // G. C. Greubel, Dec 12 2019
(Sage) [sum( (n-4)%floor((n-8)/j) for j in (1..n-8)) for n in (5..70)] # G. C. Greubel, Dec 12 2019
(GAP) List([5..70], n-> Sum([1..n-8], j-> (n-4) mod Int((n-8)/j)) ); # G. C. Greubel, Dec 12 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved