A028755 - OEIS

A028755

Nonsquares mod 42.

2, 3, 5, 6, 8, 10, 11, 12, 13, 14, 17, 19, 20, 23, 24, 26, 27, 29, 31, 32, 33, 34, 35, 38, 40, 41

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

OFFSET

1,1

LINKS

MATHEMATICA

Complement[Range[0, 41], PowerMod[Range[42], 2, 42]] (* Alonso del Arte, Dec 21 2019 *)

PROG

(PARI) for(k=0, 42, if(!issquare(Mod(k, 42)), print1(k, ", "))) \\ Hugo Pfoertner, Dec 02 2019

(Scala) (0 to 41).diff((1 to 42).map(n => (n * n) % 42)) // Alonso del Arte, Dec 21 2019

CROSSREFS

KEYWORD

nonn,fini,full,easy

AUTHOR

EXTENSIONS

Incorrect term 21 removed by Alonso del Arte, Dec 01 2019

STATUS

approved