

A028754


Nonsquares mod 41.


1



3, 6, 7, 11, 12, 13, 14, 15, 17, 19, 22, 24, 26, 27, 28, 29, 30, 34, 35, 38
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..20.


EXAMPLE

x^2 = 7 mod 41 has no solutions, so 7 is in the sequence.
x^2 = 8 mod 41 has the solutions x = 7 and x = 34. Hence 8 is not in the sequence.


MATHEMATICA

Complement[Range[40], PowerMod[Range[41], 2, 41]] (* Alonso del Arte, Jan 12 2017 *)


PROG

(Scala) (0 to 40).diff((1 to 41).map(n => n * n % 41)) // Alonso del Arte, May 01 2020


CROSSREFS

Cf. A010402, A028795.
Sequence in context: A258354 A164557 A292608 * A028795 A004780 A292046
Adjacent sequences: A028751 A028752 A028753 * A028755 A028756 A028757


KEYWORD

nonn,fini,full,easy


AUTHOR

N. J. A. Sloane


STATUS

approved



