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

1,1

Links

Table of n, a(n) for n=1..20.

Example

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.

Mathematica

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

Prog

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

Crossrefs

Cf. A010402, A028795.

Sequence in context: A258354 A164557 A292608 * A028795 A004780 A359266

Adjacent sequences: A028751 A028752 A028753 * A028755 A028756 A028757

Keyword

nonn,fini,full,easy

Author

N. J. A. Sloane

Status

approved