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1 vote
3 answers
7k views

Shortest prime number generator we could come up with?

I worked with a friend on the following prime number generator. Our goal was to make it as short and as fast as possible. This is what we came up with: ...
Joseph Farah's user avatar
7 votes
5 answers
1k views

Project Euler #35 - Circular primes solution is slow

This is my code for project euler #35 (in Python): The number, 197, is called a circular prime because all rotations of the digits: 197, 971, and 719, are themselves prime. There are thirteen such ...
Vishwa Iyer's user avatar
1 vote
2 answers
273 views

Sieve of Erathosthenes speedup

While reading HackerNews, I learned about a data set of the first 50 million primes. This would be a lot, but his website has disclaimer: n this directory I have the first fifty million primes in ...
john mangual's user avatar