Add function to ProjectEuler module and use it in all solutions
Insert formatting space in lambdas
Add naive prime function to ProjectEuler module
Solution to problem 48
Solution to problem 52
Add function to ProjectEuler module
Solution to problem 53
Add function to ProjectEuler module and use it in solution to problem 4
Solution to problem 55
Add function to ProjectEuler module
Solution to problem 56