5%
Project Euler problems that are rated at 5% difficulty.
2019
2017
- #97 - Large non-Mersenne prime
- #63 - Powerful digit counts
- #67 - Maximum path sum II
- #59 - XOR decryption
- #58 - Spiral primes
- #57 - Square root convergents
- #56 - Powerful digit sum
- #55 - Lychrel numbers
- #52 - Permuted multiples
- #79 - Passcode derivation
- #92 - Square digit chains
- #50 - Consecutive prime sum
- #49 - Prime permutations
- #48 - Self-powers
- #47 - Distinct prime factors
- #46 - Goldbach's other conjecture
2016
- #53 - Combinatoric selections
- #45 - Triangular, pentagonal, and hexagonal
- #44 - Pentagonal numbers
- #43 - Sub-string divisibility
- #42 - Coded triangle numbers
- #40 - Champernowne's constant
- #41 - Pandigital prime
- #39 - Integer right triangles
- #38 - Pandigital multiples
- #37 - Truncatable primes
- #36 - Double-base palindromes
- #35 - Circular primes
- #34 - Digit factorials
- #33 - Digit cancelling fractions
- #32 - Pandigital products
- #31 - Coin sums
- #30 - Digit fifth powers
- #29 - Distinct powers
- #28 - Number spiral diagonals
- #27 - Quadratic primes
- #26 - Reciprocal cycles
- #25 - 1000-digit Fibonacci number
- #24 - Lexicographic permutations
2015
- #23 - Non-abundant sums
- #22 - Names scores
- #21 - Amicable numbers
- #20 - Factorial digit sum
- #19 - Counting Sundays
- #18 - Maximum path sum I
- #17 - Number letter counts
- #16 - Power digit sum
- #15 - Lattice paths
- #14 - Longest Collatz sequence
- #13 - Large sum
- #12 - Highly divisible triangular number
- #11 - Largest product in a grid
- #10 - Summation of primes
- #9 - Special Pythagorean triplet
- #8 - Largest product in a series
- #7 - 10001st prime
- #6 - Sum square difference
- #5 - Smallest multiple
- #4 - Largest palindrome product
- #3 - Largest prime factor
- #2 - Even Fibonaci numbers
- #1 - Multiples of 3 and 5
