A028804 Nonsquares mod 91.

2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 17, 18, 19, 20, 21, 24, 26, 27, 28, 31, 32, 33, 34, 37, 38, 40, 41, 44, 45, 46, 47, 48, 50, 52, 54, 55, 57, 58, 59, 60, 61, 62, 63, 66, 67, 68, 69, 70, 71, 72, 73, 75, 76, 80, 82, 83, 84, 85, 86, 87, 89, 90

Offset

1,1

Links

Table of n, a(n) for n=1..63.

Mathematica

Complement[Range[0, 90], PowerMod[Range[91], 2, 91]] (* Alonso del Arte, Jan 07 2020 *)

Prog

(Scala) (0 to 90).diff((1 to 91).map(n => n * n % 91)) // Alonso del Arte, Jan 13 2020

Crossrefs

Cf. A010452.

Sequence in context: A020654 A182777 A214988 * A345475 A191894 A284955

Adjacent sequences: A028801 A028802 A028803 * A028805 A028806 A028807

Keyword

nonn,fini,full,easy

Author

N. J. A. Sloane

Status

approved