OFFSET
2,1
COMMENTS
The offset is 2 because n^2+nx-2n-x = -1 for n = 1 and all x.
a(n) seems to be exclusively prime or a product of two previous terms, and less than n excluding n = 2. x is most frequently equal to 1.
LINKS
Cody M. Haderlie, Table of n, a(n) for n = 2..10000
MATHEMATICA
Table[Min[DeleteCases[Table[If[PrimeQ[n^2+n*x-2n-x], x], {x, 0, n}], Null]], {n, 2, 100}] (*Assuming that x<n.*)
lni[n_]:=Module[{x=0}, While[!PrimeQ[n^2+n*x-2n-x], x++]; x]; Array[lni, 100, 2] (* Harvey P. Dale, May 12 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Cody M. Haderlie, May 09 2016
STATUS
approved