Prime Number Explorer
List primes with the Sieve of Eratosthenes, find the Nth prime, list primes in a range, or test whether a single number is prime. The primality test uses the deterministic Miller–Rabin test with big integers, so it stays exact and fast even for very large numbers (e.g. 2⁶¹−1). Pairs with the Prime Factorization tool. Everything runs locally in your browser.
Listing modes use the Sieve of Eratosthenes and accept bounds up to 10,000,000; the Nth-prime mode accepts N up to 1,000,000 (the millionth prime is 15,485,863). The is-prime test accepts arbitrarily large integers via big-integer Miller–Rabin with bases 2…37 (deterministic below ~3.3×10²⁴ and reliable beyond). Lists are capped at 2,000 entries on screen; the Copy button copies the full list. Everything runs locally — nothing leaves your browser.