GeneratePrimesGob finds, packs, and saves primes to a GOB file.

Load reads the contents of a file into PackedPrimes.

PackedIndex returns the index in PackedPrimes of n, or -1 if not found.

Pi is the prime counting function, returning the number of primes below n https://en.wikipedia.org/wiki/Prime-counting_function.

Prime returns true if number is prime.

Save writes PackedPrimes to a file.

SlowPrime returns whether a number is prime or not, using a brute force search.

MaxPrime is the highest value up to which we will search for primes.

PackedPrimes is a list of the first n prime numbers.

PackedPrimesEnd is the index of the final value in the PackedPrimes slice.