A prime number is a whole number greater than 1 whose only divisors are 1 and itself. Memorising the prime numbers from 1 to 50 is extremely helpful for math calculations, LCM, HCF, and aptitude tests.
The Sieve of Eratosthenes is an ancient Greek algorithm for finding all prime numbers up to any given limit. It involves writing down all numbers and crossing out multiples of 2, then multiples of 3, 5, etc.
There are exactly 15 prime numbers between 1 and 50. They are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47
To check if a number less than 50 is prime, you only need to try dividing it by the primes up to its square root (so, divide by 2, 3, 5, and 7). If none of these divide it evenly, it is a prime number.
There are exactly **25** prime numbers between 1 and 100.
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