login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A010381 Squares mod 19. 1
0, 1, 4, 5, 6, 7, 9, 11, 16, 17 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..10.

MATHEMATICA

Union[PowerMod[Range[19], 2, 19]] (* Alonso del Arte, Dec 19 2019 *)

PROG

(Sage) [quadratic_residues(19)] # Zerinvary Lajos, May 24 2009

(Scala) (1 to 19).map(n => (n * n) % 19).toSet.toSeq.sorted // Alonso del Arte, Dec 19 2019

CROSSREFS

Row 19 of A096008.

Cf. A028732.

Sequence in context: A036668 A260997 A192242 * A095033 A010399 A215046

Adjacent sequences:  A010378 A010379 A010380 * A010382 A010383 A010384

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 23 13:32 EDT 2021. Contains 348214 sequences. (Running on oeis4.)