The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A323426 a(n) = decimal concatenation of n (once), n-1 (twice), n-2 (3 times), ..., 1 (n times). 0
1, 211, 322111, 4332221111, 544333222211111, 655444333322222111111, 7665554444333332222221111111, 877666555544444333333222222211111111 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(2), a(3) and a(4) are primes.
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Cf. A098129.
Sequence in context: A096834 A013547 A181002 * A099687 A358873 A133651
Adjacent sequences: A323423 A323424 A323425 * A323427 A323428 A323429
KEYWORD
nonn,easy,base,less
AUTHOR
Eder Vanzei, Aug 30 2019
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 June 5 16:08 EDT 2024. Contains 373107 sequences. (Running on oeis4.)