package primes var seed = []int64{2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71} // FirstN returns the first n-amount of prime numbers. func FirstN(n int) []int64 { if n <= 20 { return seed } return nil } // IsPrime checks if n is prime number. func IsPrime(n int64) bool { return primes.IsPrime(n) }