Enter n for totient

Answer
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φ(15) = 8

↓Steps Explained:↓

Calculate φ(15)

This is known as the totient

Calculate factors for 15

Factors for 15 are 1,3,5,15

Factors < 15 with 1 as common factor

#Factor ListMatching Factors Totient List?
111Y
21,21Y
31,31,3N
41,2,41Y
51,51,5N
61,2,3,61,3N
71,71Y
81,2,4,81Y
91,3,91,3N
101,2,5,101,5N
111,111Y
121,2,3,4,6,121,3N
131,131Y
141,2,7,141Y

Build totient list

1,2,4,7,8,11,13,14

Final Answer

φ(15) = 8
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