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A239444 Sum{gcd(k^2 + t^2, n) * cos(2*Pi*(k^2 + t^2)/n): 0<k,t<=n} 0
1, 2, -1, 8, 41, -2, -1, 32, 81, 82, -1, -8, 313, -2, -41, 128, 545, 162, -1, 328, 1, -2, -1, -32, 1425, 626, -81, -8, 1625, -82, -1, 512, 1, 1090, -41, 648, 2665, -2, -313, 1312, 3281, 2, -1, -8, 3321, -2, -1, -128, 2401, 2850, -545, 2504, 5513, -162, -41, -32, 1, 3250, -1, -328, 7321 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
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
Sequence in context: A214731 A079899 A333469 * A224090 A013327 A359625
KEYWORD
sign
AUTHOR
STATUS
approved

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Last modified March 28 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)