Description
How many natural numbers between 43 and 274 are relatively prime to 15? And how could you determine how many natural numbers were relatively prime to 15 between any pair of natural numbers, a and b?
Explanation & Answer
The 125 numbers between 43 and 274 inclusive that are relatively prime to 15 are 43, 44, 46, 47, 49, 52, 53, 56, 58, 59, 61, 62, 64, 67, 68, 71, 73, 74, 76, 77, 79, 82, 83, 86, 88, 89, 91, 92, 94, 97, 98, 101, 103, 104, 106, 107, 109, 112, 113, 116, 118, 119, 121, 122, 124, 127, 128, 131, 133, 134, 136, 137, 139, 142, 143, 146, 148, 149, 151, 152, 154, 157, 158, 161, 163, 164, 166, 167, 169, 172, 173, 176, 178, 179, 181, 182, 184, 187, 188, 191, 193, 194, 196, 197, 199, 202, 203, 206, 208, 209, 211, 212, 214, 217, 218, 221, 223, 224, 226, 227, 229, 232, 233, 236, 238, 239, 241, 242, 244, 247, 248, 251, 253, 254, 256, 257, 259, 262, 263, 266, 268, 269, 271, 272, and 274.
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