A216129 a(n) = 7^n mod 1000.

1, 7, 49, 343, 401, 807, 649, 543, 801, 607, 249, 743, 201, 407, 849, 943, 601, 207, 449, 143, 1, 7, 49, 343, 401, 807, 649, 543, 801, 607, 249, 743, 201, 407, 849, 943, 601, 207, 449, 143, 1, 7, 49, 343, 401, 807, 649, 543, 801, 607, 249, 743, 201, 407, 849, 943, 601, 207, 449, 143, 1

Offset: 0

Author

V. Raman, Sep 01 2012

Keywords

• nonn
• easy

Comments

Period = 20.

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..1000
• Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1).

Crossrefs

Cf. A001903, A014390.

Programs

Magma

[Modexp(7, n, 1000): n in [0..110]]; // Vincenzo Librandi, Aug 16 2016

Mathematica

PowerMod[7, Range[0, 100], 1000] (* Vincenzo Librandi, Aug 16 2016 *)

PARI

for(i=0, 100, print(7^i%1000" "))

Extensions

a(0) = 1 prepended and offset changed by Vincenzo Librandi, Aug 16 2016