Easy prime number question. Need help or answer

User Generated

pynver3570uv2

Mathematics

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?

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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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