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!)
A133472 6 followed by numbers with n-1 0's between 1 and 5. 1
6, 15, 105, 1005, 10005, 100005, 1000005, 10000005, 100000005, 1000000005, 10000000005, 100000000005, 1000000000005, 10000000000005, 100000000000005, 1000000000000005, 10000000000000005, 100000000000000005 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
FORMULA
From R. J. Mathar, Nov 30 2007: (Start)
O.g.f.: -3*(-2+17*x)/((-1+x)*(-1+10*x)) = -5/(-1+x) - 1/(-1+10*x).
a(n) = 10*a(n-1) - 45. (End)
a(n) = 10^(n-1) + 5 for n >= 1. - Paolo P. Lava, Dec 19 2007
a(n) = 10^n + 5. - Vincenzo Librandi, Aug 10 2011
MATHEMATICA
Join[{6}, Table[10*FromDigits[PadRight[{1}, n, 0]]+5, {n, 20}]] (* or *) LinearRecurrence[{11, -10}, {6, 15}, 20] (* Harvey P. Dale, Sep 06 2020 *)
PROG
(Magma) [10^n+5: n in [0..20]]; // Vincenzo Librandi, Aug 10 2011
CROSSREFS
Sequence in context: A068128 A013222 A013228 * A213873 A219771 A087137
KEYWORD
nonn,easy
AUTHOR
Paul Curtz, Nov 29 2007
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 February 26 07:39 EST 2024. Contains 370335 sequences. (Running on oeis4.)