login
A167421
2^n mod 22.
0
1, 2, 4, 8, 16, 10, 20, 18, 14, 6, 12, 2, 4, 8, 16, 10, 20, 18, 14, 6, 12, 2, 4, 8, 16, 10, 20, 18, 14, 6, 12, 2, 4, 8, 16, 10, 20, 18, 14, 6, 12, 2, 4, 8, 16, 10, 20, 18, 14, 6, 12, 2, 4, 8, 16, 10, 20, 18, 14, 6, 12, 2, 4, 8, 16, 10, 20, 18, 14, 6, 12, 2, 4, 8, 16, 10, 20, 18, 14, 6
OFFSET
0,2
FORMULA
a(n)= +a(n-1) -a(n-5) +a(n-6), n>6. .G.f.: (x+2*x^2+4*x^3+8*x^4-5*x^5+11*x^6+1)/ ((1-x) * (1+x) * (x^4-x^3+x^2-x+1)). - R. J. Mathar, Apr 13 2010
MATHEMATICA
PowerMod[2, Range[0, 80], 22] (* Harvey P. Dale, Dec 11 2012 *)
PROG
(Sage) [power_mod(2, n, 22)for n in range(0, 84)] #
(PARI) a(n)=lift(Mod(2, 22)^n) \\ Charles R Greathouse IV, Mar 22 2016
CROSSREFS
Sequence in context: A277845 A277858 A366031 * A020954 A070347 A342072
KEYWORD
nonn,easy
AUTHOR
Zerinvary Lajos, Nov 03 2009
STATUS
approved