OFFSET
0,5
COMMENTS
For a guide to related sequences, see A211422.
FORMULA
a(n) = Sum_{i=1..n} Sum_{j=1..n} A010057(i*j). - Ridouane Oudra, Oct 17 2020
MATHEMATICA
t[n_] := t[n] = Flatten[Table[w^3 - x*y, {w, 1, n}, {x, 1, n}, {y, 1, n}]]
c[n_] := Count[t[n], 0]
t = Table[c[n], {n, 0, 70}] (* A211515 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Apr 14 2012
STATUS
approved