318318

Appears in sequences

• Integers x such that for some integer y we have uphi(x) = uphi(y) = x-y, where uphi(n) = A047994(n) is the unitary totient function: If n = Product p_i^e_i, uphi(n) = Product (p_i^e_i - 1).at n=23A067739
• Numbers k such that A003313(k) = A003313(7*k).at n=13A116462