25814

Appears in sequences

• Numbers n such that h(n) = 3 h(n-1) where h(n) is the length of the sequence {n, f(n), f(f(n)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)at n=31A078420
• Number of -5..5 arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero.at n=5A200035
• T(n,k)=Number of -k..k arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero.at n=50A200038
• Number of -n..n arrays x(0..5) of 6 elements with sum zero and with zeroth through 5th differences all nonzero.at n=4A200042
• Ulam numbers k such that 4*k and 16*k are also Ulam numbers.at n=36A287634