The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A010462 Squares mod 30. 7
 0, 1, 4, 6, 9, 10, 15, 16, 19, 21, 24, 25 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Range of A070452; a(k) + a(13-k) = 25, 1 <= k <= 12. - Reinhard Zumkeller, Apr 24 2009 LINKS Table of n, a(n) for n=1..12. EXAMPLE 3^2 = 9, so 9 is in the sequence. 10^2 and 20^2 are both congruent to 10 mod 30, so 10 is in the sequence. There are no solutions to x^2 = 11 mod 30, so 11 is not in the sequence. MATHEMATICA Union[PowerMod[Range[30], 2, 30]] (* Alonso del Arte, Jan 30 2018 *) PROG (Sage) [quadratic_residues(30)] # Zerinvary Lajos, May 24 2009 (Scala) (1 to 30).map(n => n * n).map(_ % 30).toSet.toSeq.sorted // Alonso del Arte, Nov 30 2019 CROSSREFS Cf. A010378, A010382, A010421. - Reinhard Zumkeller, Apr 24 2009 Row 30 of A096008. Cf. A028743. Sequence in context: A243485 A310665 A005659 * A028957 A242664 A084662 Adjacent sequences: A010459 A010460 A010461 * A010463 A010464 A010465 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 29 09:21 EST 2024. Contains 370418 sequences. (Running on oeis4.)