1, 3, 5, 7, 15, 21, 35, 105
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1, 3, 5, 15.
4 x 100 = 400 4 x 5 = 20 100 + 5 = 105
105 is not a prime number. You can readily see that 3 and 5 go into it, and 7 goes into it too. The number ends in 5, and 5 goes into any number ending in 0 or 5. The sum of the digits is 6, and when the sum of the digits is divisible by 3, then so is the original number.
To express 105 as a fraction in simplest form, we need to factorize the number. 105 can be written as 3 x 5 x 7. Therefore, the fraction in simplest form is 105/1, or simply 105.