A001218 - OEIS

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A001218

a(n) = 3^n mod 100.

4

1, 3, 9, 27, 81, 43, 29, 87, 61, 83, 49, 47, 41, 23, 69, 7, 21, 63, 89, 67, 1, 3, 9, 27, 81, 43, 29, 87, 61, 83, 49, 47, 41, 23, 69, 7, 21, 63, 89, 67, 1, 3, 9, 27, 81, 43, 29, 87, 61, 83, 49, 47, 41, 23, 69, 7, 21, 63, 89, 67

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OFFSET

0,2

COMMENTS

Period is 20.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for sequences related to final digits of numbers

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

MATHEMATICA

PowerMod[3, Range[0, 60], 100] (* Vincenzo Librandi, Aug 15 2016 *)

PROG

(PARI) a(n)=lift(Mod(3, 100)^n) \\ Charles R Greathouse IV, Dec 27 2012

(Magma) [Modexp(3, n, 100): n in [0..100]]; // Vincenzo Librandi, Aug 15 2016

CROSSREFS

Cf. A001148, A216096, A216097. - Zak Seidov, Jul 27 2014

Sequence in context: A036160 A271352 A329023 * A036158 A036136 A271350

Adjacent sequences: A001215 A001216 A001217 * A001219 A001220 A001221

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

EXTENSIONS

Definition corrected by Zak Seidov, Jul 27 2014

STATUS

approved