A070490 a(n) = n^3 mod 28.

0, 1, 8, 27, 8, 13, 20, 7, 8, 1, 20, 15, 20, 13, 0, 15, 8, 13, 8, 27, 20, 21, 8, 15, 20, 1, 20, 27, 0, 1, 8, 27, 8, 13, 20, 7, 8, 1, 20, 15, 20, 13, 0, 15, 8, 13, 8, 27, 20, 21, 8, 15, 20, 1, 20, 27, 0, 1, 8, 27, 8, 13, 20, 7, 8, 1, 20, 15, 20, 13, 0, 15, 8, 13, 8, 27, 20, 21, 8, 15, 20

Offset

0,3

Comments

a(n) repeats after 28 terms. - Vincenzo Librandi, Oct 03 2015

a(14k) = 0. - Altug Alkan, Oct 03 2015

Links

G. C. Greubel, Table of n, a(n) for n = 0..1000

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, 1).

Mathematica

Table[PowerMod[n, 3, 28], {n, 0, 100}] (* Vincenzo Librandi, Oct 03 2015 *)

Prog

(Sage) [power_mod(n, 3, 28 ) for n in range(0, 81)] # Zerinvary Lajos, Oct 30 2009
(PARI) vector(100, n, (n-1)^3 % 28); \\ Altug Alkan, Oct 03 2015

Crossrefs

Cf. A000578, A070489.

Sequence in context: A282462 A056555 A070491 * A088378 A005064 A056551

Adjacent sequences: A070487 A070488 A070489 * A070491 A070492 A070493

Keyword

nonn,easy

Author

N. J. A. Sloane, May 12 2002

Status

approved