OFFSET
1,1
MATHEMATICA
Complement[Range[0, 26], PowerMod[Range[27], 2, 27]] (* Alonso del Arte, Nov 27 2019 *)
PROG
(Scala) val squaresMod27 = (0 to 26).map(n => n * n).map(_ % 27)
(0 to 26).diff(squaresMod27) // Alonso del Arte, Nov 27 2019
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
STATUS
approved