30%

Project Euler problems that are rated at 30% difficulty.

2020

• #173 - Using up to one million tiles how many different 'hollow' square laminae can be formed? 02 Jan

2019

• #108 - Diophantine reciprocals I 20 Aug
• #113 - Non-bouncy numbers 11 Feb

2017

• #100 - Arranged probability 18 Aug
• #116 - Red, green or blue tiles 28 Jul
• #123 - Prime square remainders 06 Jul
• #78 - Coin partitions 05 Jul