55% Project Euler problems that are rated at 55% difficulty.2020 #285 - Pythagorean Odds 28 May 2019 #193 - Squarefree Numbers 11 Jul #140 - Modified Fibonacci golden nuggets 23 Jun #126 - Cuboid layers 21 Jun 2017 #158 - Exploring strings for which only one character comes lexicographically after its neighbour to the left 01 Aug