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!)
A098210 a(n) = -1 + A093137(n)^2. 4
0, 15, 1155, 111555, 11115555, 1111155555, 111111555555, 11111115555555, 1111111155555555, 111111111555555555, 11111111115555555555, 1111111111155555555555, 111111111111555555555555 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
a(n) = (1/9)*(10^n-1)*(5+10^n). - Vincenzo Librandi, Jun 02 2013
EXAMPLE
Like other -1 + square of near-repdigits give special digit patterns: (33333334^2) - 1 = 11111115555555.
MATHEMATICA
Table[(1/9) (10^n - 1) (5 + 10^n), {n, 0, 25}] (* Vincenzo Librandi, Jun 02 2013 *)
PROG
(Magma) [(1/9)*(10^n-1)*(5+10^n): n in [0..15]]; // Vincenzo Librandi, Jun 02 2013
CROSSREFS
Cf. A093137.
Sequence in context: A212857 A266581 A337677 * A090213 A230669 A027492
KEYWORD
nonn,easy
AUTHOR
Labos Elemer, Oct 20 2004
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 July 12 19:36 EDT 2024. Contains 374252 sequences. (Running on oeis4.)