Copyright © University of Cambridge. All rights reserved.

'12345' printed from http://nrich.maths.org/

Show menu

See all short problems arranged by curriculum topic in the short problems collection

The pattern 123451234512345... is continued to form a 2000 digit number. What is the sum of all 2000 digits?

 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

This problem is taken from the UKMT Mathematical Challenges.