OFFSET
1,2
MATHEMATICA
GGG[n_] := Sum[GCD[k^2 + t^2, n] Cos[2 Pi (k^2 + t^2)/n], {k, 1, n}, {t, 1, n}]; Table[Round[GGG[n]], {n, 1, 111}]
CROSSREFS
KEYWORD
sign
AUTHOR
José María Grau Ribas, Mar 22 2014
STATUS
approved