There are no numbers below 100 that are divisible by more than 3 prime factors.
Those numbers are in the group:
30 = 2 * 3 * 5
42 = 2 * 3 * 7
66 = 2 * 3 * 11
78 = 2 * 3 * 13
70 = 2 * 5 * 7
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no, not all prime numbers are closed under addition. why? because, when you add 2 prime numbers you will not always get a prime number. example: 5+3= 8 5 and 3 are prime numbers but their sum is 8 which is a composite number..
Prime Numbers under 6 are 2,3,5
There are 34 prime numbers under 140.
So we eliminate prime numbers. Note that the number 1 is neither prime nor composite. We have left:4689101214151618202122242526272830323334353638394042444546484950515254555657586062636465666869707274757677788081828485868788909192939495969899100
Odd prime numbers under 15 are prime numbers that are greater than 2 and do not have any factors other than 1 and themselves. The odd prime numbers under 15 are 3, 5, 7, 11, and 13. These numbers cannot be divided evenly by any other number except 1 and themselves, making them prime.