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A028742 Nonsquares mod 29. 1
2, 3, 8, 10, 11, 12, 14, 15, 17, 18, 19, 21, 26, 27 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Since 12 is not a perfect square and there are no solutions to x^2 = 12 mod 29, 12 is in the sequence.

Although 13 is not a perfect square either, there are solutions to x^2 = 13 mod 29, such as x = 10, x = 19, so 13 is not in the sequence.

MATHEMATICA

Complement[Range[0, 28], PowerMod[Range[29], 2, 29]] (* Alonso del Arte, Nov 29 2019 *)

PROG

(Scala) val squaresMod29 = (1 to 29).map(n => n * n).map(_ % 29)

(0 to 28).diff(squaresMod29) // Alonso del Arte, Nov 29 2019

CROSSREFS

Cf. A010391.

Sequence in context: A019307 A342849 A247580 * A028771 A023709 A317539

Adjacent sequences:  A028739 A028740 A028741 * A028743 A028744 A028745

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified May 13 17:46 EDT 2021. Contains 343864 sequences. (Running on oeis4.)