A108812 11^n mod 50.

1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41, 1, 11, 21, 31, 41

Offset

0,2

Comments

An example of a sequence which is both in arithmetic and geometric progression.

References

E. Schmid, Problem 961, Math. Mag., 50 (No. 1, 1977), 52.

Links

Table of n, a(n) for n=0..74.

Mathematica

PowerMod[11, Range[0, 120], 50] (* or *) PadRight[{}, 120, {1, 11, 21, 31, 41}] (* Harvey P. Dale, Aug 28 2017 *)

Prog

(PARI) a(n)=lift(Mod(11, 50)^n) \\ Charles R Greathouse IV, Mar 22 2016

Crossrefs

Sequence in context: A068633 A225297 A123849 * A216100 A017281 A061589

Adjacent sequences: A108809 A108810 A108811 * A108813 A108814 A108815

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 31 2005

Status

approved