101, 173 and 911 are all prime numbers. 173911 is not.
101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199 211 223 227 229 233 239 241.
1, 3, 5, 7, 9, 11, 15, 21, 25, 33, 35, 45, 55, 63, 75, 77, 99, 105, 165, 175, 225, 231, 275, 315, 385, 495, 525, 693, 825, 1155, 1575, 1925, 2475, 3465, 5775, 17325 3, 5, 7 and 11 are prime.
Two (or more) integers have a common factor - e.g., the greatest common factor of 173 and 100 is 1, or the greatest common factor of 173 and 519 is 173. The question makes no sense with one number. 173 is a prime, by the way.
1, 5, 173, 865 -1, -5, -173, -865
There are eight: 108, 117, 126, 135, 144, 153, 162, 171.
9 multiplesnine104 112 120 128 136 144 152 160 168
173, 346, 519, 692, 865 . . .
There are 21 primes between 101 and 200. These are: 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199
All multiples of 173 (which are infinite) including 173, 346, 519, 692, 865, 1038 . . .
Including 101 itself, the prime numbers from 101 to 200 are 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199. This is 21 numbers. (If you don't count 101 itself, then there are 20 primes, not 21.)
Including 101 itself, the prime numbers from 101 to 200 are 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199. This is 21 numbers. (If you don't count 101 itself, then there are 20 primes, not 21.)
101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199
The prime numbers between 101 and 200 are 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163 ,167, 173, 179, 181, 191, 193, 197, and 199.
101, 173 and 911 are all prime numbers. 173911 is not.
103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199.
Here they are (20): 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197.