Prime Numbers

Pick a value to view its full reference table.

The first 10 prime numbers. Primes are divisible only by 1 and themselves — they are the building blocks of all integers.

Primes are the indivisible atoms of arithmetic — integers greater than 1 whose only divisors are 1 and themselves. Every other integer splits into primes uniquely, the fact the prime factorization calculator is built on. They thin out as numbers grow — 25 primes below 100, 168 below 1000 — yet never run out: multiply any finite list of them together, add 1, and no listed prime divides the result, Euclid’s argument. Sieving by the primes up to √N finds every prime below N.

All 10 prime numbers pages include a full data table, a worked explanation, and related calculators. Start withthe first 10or jump straight to the value you need below.

• First 10
• First 20
• First 30
• First 40
• First 50
• First 60
• First 70
• First 80
• First 90
• First 100