A014392 Final 2 digits of 8^n.

1, 8, 64, 12, 96, 68, 44, 52, 16, 28, 24, 92, 36, 88, 4, 32, 56, 48, 84, 72, 76, 8, 64, 12, 96, 68, 44, 52, 16, 28, 24, 92, 36, 88, 4, 32, 56, 48, 84, 72, 76, 8, 64, 12, 96, 68, 44, 52, 16, 28, 24, 92, 36, 88, 4, 32, 56

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• base
• easy

Comments

Periodic with period = 20. - Harvey P. Dale, Jul 22 2025

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, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1).

Programs

Magma

[Modexp(8, n, 100): n in [0..110]]; // Vincenzo Librandi, Aug 15 2016

Mathematica

PowerMod[8, Range[0, 60], 100] (* Vincenzo Librandi, Aug 15 2016 *)
PadRight[{1},120,{76,8,64,12,96,68,44,52,16,28,24,92,36,88,4,32,56,48,84,72}] (* or *) LinearRecurrence[{1,0,0,0,0,0,0,0,0,-1,1},{1,8,64,12,96,68,44,52,16,28,24,92},120] (* Harvey P. Dale, Jul 22 2025 *)