OFFSET
0,3
COMMENTS
The sequence has period: {0,1,2,3,6,1,0,7,8,5,0,3,8,1,2,1,4,7,2,3,2,7,2,1,0,3,4,7,4,5,6,5,6,7,8,1,6,5,2,3,0,5,8,3,6,7,6,9,2,7,8,7,2,7,6,5,8,9,2,9,0,1} of length = 62.
FORMULA
a(n)=mod(a(n-1)+a(n-2)+a(n-3), 10); a(1)=0, a(2)=1;a(3)=2.
MATHEMATICA
s={a=0, b=1, c=2}; Do[d=Mod[a+b+c, 10]; s=Append[s, d]; a=b; b=c; c=d, {m, 200}]; s
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, May 25 2005
STATUS
approved