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A028794 Nonsquares mod 81. 1
2, 3, 5, 6, 8, 11, 12, 14, 15, 17, 18, 20, 21, 23, 24, 26, 27, 29, 30, 32, 33, 35, 38, 39, 41, 42, 44, 45, 47, 48, 50, 51, 53, 54, 56, 57, 59, 60, 62, 65, 66, 68, 69, 71, 72, 74, 75, 77, 78, 80 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..50.

MATHEMATICA

Complement[Range[0, 80], PowerMod[Range[81], 2, 81]] (* Alonso del Arte, Dec 27 2019 *)

PROG

(Scala) (0 to 80).diff((1 to 81).map(n => (n * n) % 81)) // Alonso del Arte, Dec 27 2019

CROSSREFS

Cf. A010442.

Sequence in context: A028806 A028731 A028740 * A028966 A028767 A268226

Adjacent sequences:  A028791 A028792 A028793 * A028795 A028796 A028797

KEYWORD

nonn,fini,full,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified April 10 08:09 EDT 2021. Contains 342845 sequences. (Running on oeis4.)