Prime Numbers

Greek mathematician Euclid of Alexandria, 300BC.

Prime Number
A prime number is a natural number (no ending) greater than 1 that is not a product of two smaller numbers. A natural number greater than 1 that is not prime is called a composite number.

All prime numbers are written in red.
All prime numbers with a gap of 10(s) {a decade(s)} are highlighted in yellow.

A stack of two prime numbers is called a couplet and a stack of three prime numbers a triplet.

25 Prime Numbers from 1 to 100 The Characteristics of Prime Numbers
1. The list of prime numbers is infinite (Greek mathematician Euclid of Alexandria, 300BC).

2. Twin primes (French mathematician Alphose de Polignac, 1849).

3. Prime numbers are associated with time (American mathematical biologist Glenn Webb, 2001). Prime number is prime time. They are about the past, the present, and the future of the universe. Negative prime numbers do exist.

4. All prime numbers are ending in 1, 3, 7, and 9, but not all numbers ending in 1, 3, 7, and 9 are prime. They will never be ending in 2, 4, 5, 6, 8, and 0. The number 2 is the only even number that is prime. The number 5 is the only odd number that is prime, and the numbers 1 and 9 are the only odd numbers that are not prime.

5. By joining all prime numbers ending in 1 with 3 and 7 with 9, slanting lines are formed. (Diagonal lines composed of prime numbers were discovered in Ulam spiral by Polish-born American mathematician Stanisław Marcin Ulam, 1963.)

21 Prime Numbers from 101 to 200 16 Prime Numbers from 201 to 300 16 Prime Numbers from 301 to 400 17 Prime Numbers from 401 to 500 14 Prime Numbers from 501 to 600 16 Prime Numbers from 601 to 700 14 Prime Numbers from 701 to 800 15 Prime Numbers from 801 to 900 14 Prime Numbers from 901 to 1000 16 Prime Numbers from 1001 to 1100 12 Prime Numbers from 1101 to 1200 15 Prime Numbers from 1201 to 1300 11 Prime Numbers from 1301 to 1400 17 Prime Numbers from 1401 to 1500 12 Prime Numbers from 1501 to 1600 15 Prime Numbers from 1601 to 1700 12 Prime Numbers from 1701 to 1800 12 Prime Numbers from 1801 to 1900 13 Prime Numbers from 1901 to 2000 14 Prime Numbers from 2001 to 2100 10 Prime Numbers from 2101 to 2200 15 Prime Numbers from 2201 to 2300 15 Prime Numbers from 2301 to 2400 Prime Time from 13c to 21c

Prime time