Let's see313233033435363738393So there are 11 numbers from 1-100 that have a 3.
The sum of 2 and 97 is 99.
Here are all of the prime numbers such that 0
5
The sum of these composite numbers, including 100, is 3989.The sum of all numbers between 1 and 100 is 5,050. From this we need to subtract the sum of 1 plus all the prime numbers below 100. The sum of the primes is 1,060. Subtracting (1 + 1060) or 1,061 from 5,050 yields 3,989.
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47.
1, 3, 5, 7, 9, 11 and just keep adding 2 until you get to 99.
They are the numbers that have more than two factors
They are: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 and 47
20.
1to 100
Any multiple of 2520.