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2. 243 (number) - Wikipedia

   en.wikipedia.org/wiki/243_(number)

   243 (two hundred [and] forty-three) is the natural number following 242 and preceding 244. Additionally, 243 is: the only 3-digit number that is a fifth power (3 5). a perfect totient number. [1] the sum of five consecutive prime numbers (41 + 43 + 47 + 53 + 59). an 82-gonal number.

3. Perfect totient number - Wikipedia

   en.wikipedia.org/wiki/Perfect_totient_number

   In number theory, a perfect totient number is an integer that is equal to the sum of its iterated totients.That is, one applies the totient function to a number n, apply it again to the resulting totient, and so on, until the number 1 is reached, and adds together the resulting sequence of numbers; if the sum equals n, then n is a perfect totient number.

4. Euler's totient function - Wikipedia

   en.wikipedia.org/wiki/Euler's_totient_function

   A totient number is a value of Euler's totient function: that is, an m for which there is at least one n for which φ(n) = m. The valency or multiplicity of a totient number m is the number of solutions to this equation. [40] A nontotient is a natural number which is not a totient number. Every odd integer exceeding 1 is trivially a nontotient.

5. Euler's theorem - Wikipedia

   en.wikipedia.org/wiki/Euler's_theorem

   If a is any number coprime to n then a is in one of these residue classes, and its powers a, a 2, ... , a k modulo n form a subgroup of the group of residue classes, with a k ≡ 1 (mod n). Lagrange's theorem says k must divide φ ( n ) , i.e. there is an integer M such that kM = φ ( n ) .

6. Bell series - Wikipedia

   en.wikipedia.org/wiki/Bell_series

   The following is a table of the Bell series of well-known arithmetic functions. The Möbius function has () =.; The Mobius function squared has () = +.; Euler's totient has () =.; The multiplicative identity of the Dirichlet convolution has () =

7. Highly cototient number - Wikipedia

   en.wikipedia.org/wiki/Highly_cototient_number

   The cototient of is defined as (), i.e. the number of positive integers less than or equal to that have at least one prime factor in common with .For example, the cototient of 6 is 4 since these four positive integers have a prime factor in common with 6: 2, 3, 4, 6.