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!)
A104685 Smallest semiprime containing exactly n 3's. 0
34, 33, 1333, 13333, 133333, 3323333, 13333333, 303333333, 1333333333, 33133333333, 233333333333, 2333333333333, 13333333333333, 233333333333333, 3331333333333333, 33333133333333333, 133333333333333333 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
a(2)=33 because 33 is the smallest semiprime containing exactly two 3's.
CROSSREFS
Sequence in context: A022990 A023476 A361759 * A204773 A291512 A165855
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 24 2005
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 May 22 18:14 EDT 2024. Contains 372758 sequences. (Running on oeis4.)