This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
Union[PowerMod[Range[39], 2, 39]] (* Vincenzo Librandi, Dec 27 2019 *)
[quadratic_residues(39)] # Zerinvary Lajos, May 24 2009
Complement[Range[0, 77], PowerMod[Range[78], 2, 78]] (* Alonso del Arte, Dec 26 2019 *)
for(k=0, 78, if(!issquare(Mod(k, 78)), print1(k, ", "))) \\ Hugo Pfoertner, Dec 02 2019
(0 to 77).diff((1 to 78).map(n => (n * n) % 78)) // Alonso del Arte, Dec 26 2019
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