Scribbles

Project Euler #45: Triangular, pentagonal, and hexagonal
Project Euler #44: Pentagon numbers
Project Euler #43: Sub-string divisibility
Project Euler #42: Coded triangular numbers
Project Euler #41: Pandigital prime
Project Euler #40: Champernowne's constant
Project Euler #39: Integer right triangles
Project Euler #38: Pandigital multiples
Project Euler #37: Truncatable primes
Project Euler #36: Double-base palindromes
Project Euler #35: Circular primes
Project Euler #34: Digit factorials
Project Euler #33: Digit cancelling fractions
Project Euler #32: Pandigital products
Project Euler #31: Coin sums
Project Euler #30: Digit fifth powers
Project Euler #29: Distinct powers
Project Euler #28: Number spiral diagonals