Copyright © University of Cambridge. All rights reserved.

'Prime Pairs' printed from http://nrich.maths.org/

Show menu

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

How many pairs of numbers of the form $x$, $2x+1$ are there in which both numbers are prime numbers less than $100$

 

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.