A028744 Nonsquares mod 31.

3, 6, 11, 12, 13, 15, 17, 21, 22, 23, 24, 26, 27, 29, 30

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• fini
• full
• easy

Crossrefs

Cf. A010392.

Programs

Mathematica

Complement[Range[0, 30], PowerMod[Range[31], 2, 31]] (* Alonso del Arte, Dec 31 2019 *)

Scala

(0 to 30).diff((1 to 31).map(n => n * n % 31)) // Alonso del Arte, Dec 31 2019