Answer :
This is Problem 7 from the Euler project. Famous for the fact that it is almost incalculable through regular math methods. It may be solvable using the Sieve of Eratosthenes and a computer program that has a little bit of time. I'd argue that, for this reason, this question actually ought be placed under computer science, and might be beyond the capabilities of the website. It is sure interesting though, maybe I'll try and solve it one day.