Home > Numbers
Naoish numbers (Posted on 2020-11-16) |
|
We say an integer n is naoish if n≥90 and the second-to-last digit of n (in decimal notation) is equal to 9. For example, 10798, 1999 and 90 are naoish, whereas 9900, 2009 and 9 are not. Nino expresses 2020 as a sum:
2020=n1+n2+...+nk
where each of the nj is naoish.
What is the smallest positive number k for which Nino can do this?
Comments: (
You must be logged in to post comments.)
|
|
Please log in:
Forums (0)
Newest Problems
Random Problem
FAQ |
About This Site
Site Statistics
New Comments (5)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On
Chatterbox:
|