|
| |
|
|
A116525
|
|
a(0)=1, a(1)=1, a(n)=11a(n/2) for n=2,4,6,..., a(n)=10a((n-1)/2)+a((n+1)/2) for n=3,5,7,....
|
|
0
| |
|
|
0, 1, 11, 21, 121, 131, 231, 331, 1331, 1341, 1441, 1541, 2541, 2641, 3641, 4641, 14641, 14651, 14751, 14851, 15851, 15951, 16951, 17951, 27951, 28051, 29051, 30051, 40051, 41051, 51051, 61051, 161051, 161061, 161161, 161261, 162261
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
COMMENTS
| An 11-divide version of A084230.
The Harborth : f(2^k)=3^k suggests that a family of sequences of the form: f(2^k)=Prime[n]^k There does indeed seem to be an infinite family of such functions.
|
|
|
REFERENCES
| Harborth, H. Number of Odd Binomial Coefficients. Proc. Amer. Math. Soc. 62, 19-22, 1977
|
|
|
LINKS
| Eric Weisstein's World of Mathematics, Stolarsky-Harborth Constant
|
|
|
MAPLE
| a:=proc(n) if n=0 then 0 elif n=1 then 1 elif n mod 2 = 0 then 11*a(n/2) else 10*a((n-1)/2)+a((n+1)/2) fi end: seq(a(n), n=0..42);
|
|
|
MATHEMATICA
| b[0] := 0 b[1] := 1 b[n_?EvenQ] := b[n] = 11*b[n/2] b[n_?OddQ] := b[n] = 10*b[(n - 1)/2] + b[(n + 1)/2] a = Table[b[n], {n, 1, 25}]
|
|
|
CROSSREFS
| Cf. A006046, A077465.
Sequence in context: A096104 A126299 A166707 * A094623 A034922 A015446
Adjacent sequences: A116522 A116523 A116524 * A116526 A116527 A116528
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Roger Bagula (rlbagulatftn(AT)yahoo.com), Mar 15 2006
|
|
|
EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 16 2005
|
| |
|
|
