|
Search: id:A125439
|
|
|
| A125439 |
|
Number of base 27 circular n-digit numbers with adjacent digits differing by 7 or less. |
|
+0
1
|
|
| 1, 27, 349, 3723, 46157, 583687, 7554133, 99104599, 1313531925, 17539619163, 235514695099, 3175602492309, 42952775347889, 582333628754047, 7908808568321989, 107551307959489303, 1463999937423331797
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
[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
|
|
PROGRAM
|
(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: A128831 A018797 A133050 this_sequence A010943 A022622 A030648
Adjacent sequences: A125436 A125437 A125438 this_sequence A125440 A125441 A125442
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
|
|
|
Search completed in 0.006 seconds
|
