|
|
A125425
|
|
Number of base 13 circular n-digit numbers with adjacent digits differing by 7 or less.
|
|
0
|
|
|
1, 13, 139, 1357, 14591, 158703, 1735537, 19008065, 208287079, 2282738371, 25019137619, 274217831395, 3005531920793, 32941830915539, 361055827137585, 3957318988935327, 43373831073632999, 475394897638619787
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
[Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
|
|
LINKS
|
|
|
PROG
|
(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|