44505

Appears in sequences

• Number of n-step walks on square lattice in the first quadrant which finish at distance n-3 from the x-axis.at n=42A005564
• Numbers k such that sopf(k) = 2*sopf(k+1), where sopf(k) = A008472.at n=34A064112
• 30 'Reverse and Add' steps are needed to reach a palindrome.at n=23A065319
• Numbers k such that (k+1)*phi(k) is a perfect square.at n=24A069952
• Constant term when a polynomial of degree <= n is fitted to the first n+1 upper members of the twin prime pairs.at n=12A082675
• Odd n such that 2*phi(n) < n, but there does not exist an even k < n with phi(k) = phi(n).at n=8A118700
• Number of (n+2) X 9 0..1 matrices with each 3 X 3 subblock idempotent.at n=16A224558
• Numbers n such that n and n+1 both have 24 divisors.at n=23A274362
• Numbers k such that k and k+1 both have the prime signature (2,1,1,1) (A189982).at n=10A336658