login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A037761 Base-7 digits are, in order, the first n terms of the periodic sequence with initial period 3,0,1,2. 2
3, 21, 148, 1038, 7269, 50883, 356182, 2493276, 17452935, 122170545, 855193816, 5986356714, 41904497001, 293331479007, 2053320353050, 14373242471352, 100612697299467, 704288881096269, 4930022167673884 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
From Colin Barker, Apr 30 2014: (Start)
a(n) = (-100-25*(-1)^n-(24-i*32)*(-i)^n-(24+32*i)*i^n+173*7^n)/400, where i=sqrt(-1).
a(n) = 7*a(n-1)+a(n-4)-7*a(n-5).
G.f.: x*(2*x^3+x^2+3) / ((x-1)*(x+1)*(7*x-1)*(x^2+1)). (End)
MATHEMATICA
CoefficientList[Series[(2 x^3 + x^2 + 3)/((x - 1) (x + 1) (7 x - 1) (x^2 + 1)), {x, 0, 30}], x] (* Vincenzo Librandi, May 01 2014 *)
PROG
(PARI) Vec(x*(2*x^3+x^2+3)/((x-1)*(x+1)*(7*x-1)*(x^2+1)) + O(x^100)) \\ Colin Barker, Apr 30 2014
CROSSREFS
Sequence in context: A088088 A206638 A357652 * A037649 A037768 A037656
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)