OFFSET
1,4
COMMENTS
See Bingham link for definitions.
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..10000
Aram Bingham, Ternary arithmetic, factorization, and the class number one problem, arXiv:2002.02059 [math.NT], 2020. See Table 1 p. 14.
MATHEMATICA
a[n_] := Block[{c=0, z=1}, While[3 z^2 - 3 z + 1 <= n, c += Length@ Solve[ x y z - (x-1) (y-1) (z-1) == n && x >= y >= z, {x, y}, Integers]; z++]; c]; Array[a, 88] (* Giovanni Resta, Feb 07 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Feb 07 2020
EXTENSIONS
More terms from Giovanni Resta, Feb 07 2020
STATUS
approved