168630

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=19A067739
• Index of first occurrence of n in A109883, or -1 if n does not occur in A109883.at n=23A109886
• Numbers n such that n is the average of four consecutive primes n-13, n-1, n+1 and n+13.at n=23A260959
• Numbers k such that usigma(k) >= 3*k, where usigma(k) = sum of unitary divisors of k (A034448).at n=31A285615
• Products of 6 distinct primes that are sandwiched between twin prime numbers.at n=7A378097
• Squarefree 3-abundant numbers: squarefree numbers k such that A000203(k) > 3*k.at n=31A387153