|
|
A049250
|
|
Smallest nonnegative value taken on by 11x^2 - ny^2 for an infinite number of integer pairs (x, y).
|
|
0
|
|
|
2, 1, 8, 7, 6, 3, 1, 3, 2, 1, 0, 11, 11, 2, 11, 11, 3, 9, 1, 11, 11, 11, 7, 3, 11, 2, 8, 4, 3, 5, 11, 3, 11, 10, 1, 8, 7, 6, 5, 4, 3, 2, 1, 0, 11, 11, 11, 11, 2, 1, 3, 11, 6, 5, 11, 8, 11, 2, 8, 11, 11, 3, 9, 11, 11, 11, 7, 3, 11, 11, 11, 11, 11, 1, 11, 4, 11, 2, 1, 11, 2, 11, 1, 11, 11, 6
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
p = 11; f[n_, z_] := FindInstance[x > 0 && y > 0 && p*x^2 - n*y^2 == z, {x, y}, Integers, 1]; a[n_] := For[z = 0, z <= p, z = z + GCD[n, p], Which[n == 64, z = 11; fz = $Aborted, True, fz = TimeConstrained[f[n, z], 300]]; fz = If[fz === $Aborted, {{x -> Null, y -> Null}}, fz]; If[fz =!= {}, Print["a(", n, ") = ", z, " {x, y} = ", {x, y} /. fz[[1]]]; Return[z]]]; Table[a[n], {n, 1, 86}] (* Jean-François Alcover, Oct 11 2016 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|