70634

Appears in sequences

• Positive integers n such that phi(n) - d(n) = phi(n+1) - d(n+1) where d(n) is the number of divisors of n.at n=6A063069
• Numbers n such that |phi(n+1)-phi(n)| = |d(n+1)-d(n)|, where phi is Euler's totient function and d(n) = number of divisors of n.at n=12A066219
• G.f. A(x) satisfies: A(x) = 1 / (1 - x - x * A(-3*x)).at n=5A349033
• Number of n-digit positive integers where all pairs of consecutive digits have a difference of at least 7.at n=12A383079