A010423 -id:A010423

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A010392

Squares mod 31.

+10
3

0, 1, 2, 4, 5, 7, 8, 9, 10, 14, 16, 18, 19, 20, 25, 28

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..16.

MATHEMATICA

Union[PowerMod[Range[31], 2, 31]] (* Alonso del Arte, Dec 31 2019 *)

PROG

(Sage) [quadratic_residues(31)] # Zerinvary Lajos, May 24 2009

(Scala) (1 to 31).map(n => n * n % 31).toSet.toSeq.sorted // Alonso del Arte, Dec 31 2019

CROSSREFS

Row 31 of A096008.

Cf. A010423, A028744.

KEYWORD

nonn,fini,full,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

A028775

Nonsquares mod 62.

+10
1

3, 6, 11, 12, 13, 15, 17, 21, 22, 23, 24, 26, 27, 29, 30, 34, 37, 42, 43, 44, 46, 48, 52, 53, 54, 55, 57, 58, 60, 61

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..30.

MATHEMATICA

Complement[Range[0, 61], PowerMod[Range[62], 2, 62]] (* Alonso del Arte, Dec 31 2019 *)

PROG

(Scala) (0 to 61).diff((1 to 62).map(n => n * n % 62)) // Alonso del Arte, Dec 31 2019

CROSSREFS

Cf. A010423.