A125435 Number of base 23 circular n-digit numbers with adjacent digits differing by 7 or less.

1, 23, 289, 3047, 37137, 462163, 5880121, 75773539, 985257889, 12888815603, 169303842569, 2230130203467, 29431207313841, 388895110406371, 5143074692086361, 68054649404120347, 900857522223771201

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

Table of n, a(n) for n=0..16.

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

Sequence in context: A022588 A268992 A199031 * A086943 A131273 A023021

Adjacent sequences: A125432 A125433 A125434 * A125436 A125437 A125438

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved