A028754 Nonsquares mod 41.

3, 6, 7, 11, 12, 13, 14, 15, 17, 19, 22, 24, 26, 27, 28, 29, 30, 34, 35, 38

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• fini
• full
• easy

Examples

			x^2 = 7 mod 41 has no solutions, so 7 is in the sequence.
x^2 = 8 mod 41 has the solutions x = 7 and x = 34. Hence 8 is not in the sequence.
		

Crossrefs

Cf. A010402, A028795.

Programs

Mathematica

Complement[Range[40], PowerMod[Range[41], 2, 41]] (* Alonso del Arte, Jan 12 2017 *)

Scala

(0 to 40).diff((1 to 41).map(n => n * n % 41)) // Alonso del Arte, May 01 2020