A070464 a(n) = n^2 mod 42.

0, 1, 4, 9, 16, 25, 36, 7, 22, 39, 16, 37, 18, 1, 28, 15, 4, 37, 30, 25, 22, 21, 22, 25, 30, 37, 4, 15, 28, 1, 18, 37, 16, 39, 22, 7, 36, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 36, 7, 22, 39, 16, 37, 18, 1, 28, 15, 4, 37, 30, 25, 22, 21, 22, 25, 30, 37, 4, 15, 28, 1, 18, 37, 16, 39

Offset

0,3

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..1400

Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).

Formula

a(n) = a(n-42). - G. C. Greubel, Mar 25 2016

Mathematica

Table[Mod[n^2, 42], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 27 2011 *)
PowerMod[Range[0, 80], 2, 42] (* Harvey P. Dale, Mar 13 2019 *)

Prog

(Magma) [n^2 mod 42: n in [0..80]]; // Vincenzo Librandi, Apr 27 2011
(PARI) a(n)=n^2%42 \\ Charles R Greathouse IV, Apr 06 2016

Crossrefs

Cf. A070461, A070462, A070463.

Sequence in context: A070467 A070466 A070465 * A070463 A070462 A070461

Adjacent sequences: A070461 A070462 A070463 * A070465 A070466 A070467

Keyword

nonn,easy

Author

N. J. A. Sloane, May 12 2002

Status

approved