OFFSET
3,5
LINKS
G. C. Greubel, Table of n, a(n) for n = 3..1000
FORMULA
a(n) = Sum_{j=1..n-4} mod(n-2, floor((n-4)/j)). - G. C. Greubel, Dec 12 2019
MAPLE
seq( add(`mod`(n-2, floor((n-4)/j)), j=1..n-4), n=3..70); # G. C. Greubel, Dec 12 2019
MATHEMATICA
Table[Sum[Mod[n-2, Floor[(n-4)/j]], {j, n-4}], {n, 3, 70}] (* G. C. Greubel, Dec 12 2019 *)
PROG
(PARI) vector(70, n, sum(j=1, n-2, lift(Mod(n, (n-2)\j))) ) \\ G. C. Greubel, Dec 12 2019
(Magma) [ n lt 5 select 0 else &+[((n-2) mod Floor((n-4)/j)): j in [1..n-4]]: n in [3..70]]; // G. C. Greubel, Dec 12 2019
(Sage) [sum( (n-2)%floor((n-4)/j) for j in (1..n-4)) for n in (3..70)] # G. C. Greubel, Dec 12 2019
(GAP) List([3..70], n-> Sum([1..n-4], j-> (n-2) mod Int((n-4)/j)) ); # G. C. Greubel, Dec 12 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved