Tuesday, January 11, 2011

Interesting sequences

http://oeis.org/A108896

Numbers such that the outer 2 digits are 9 and the inner digits are 4.

949, 9449, 94449, 944449, 9444449, 94444449, 944444449, ...

These numbers are all composite.


Posted by at

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)