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!)
A106657 Smallest semiprime ending in exactly n 2's. 0
62, 22, 4222, 32222, 622222, 1222222, 142222222, 122222222, 7222222222, 62222222222, 622222222222, 4222222222222, 62222222222222, 722222222222222, 10222222222222222, 202222222222222222, 322222222222222222 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
a(3)=4222 is a term because 4222 is the smallest semiprime ending in exactly three 2's.
CROSSREFS
Sequence in context: A058913 A236301 A218166 * A033382 A143733 A296766
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, May 12 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 April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)