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A028804 Nonsquares mod 91. 1
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 (list; graph; refs; listen; history; text; internal format)
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 * A191894 A284955 A093480

Adjacent sequences:  A028801 A028802 A028803 * A028805 A028806 A028807

KEYWORD

nonn,fini,full,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified August 4 19:03 EDT 2021. Contains 346455 sequences. (Running on oeis4.)