22445

Appears in sequences

• Trajectory of 3 under map n->39n+1 if n odd, n->n/2 if n even.at n=6A037117
• Triangle T(n,k), 0<=k<=n, read by rows; given by [0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, ...] DELTA [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ...] where DELTA is the operator defined in A084938.at n=49A094456
• a(n) = floor(2*(3/2)^n).at n=23A147788
• a(n) = round(2*(3/2)^n), using round-to-even method.at n=22A147789
• Numbers k such that p^2 divides k, where p = A006530(k), the largest prime factor of k, and sigma(k) does not have any prime factor larger than p.at n=27A336354
• a(n) = 1 + Sum_{k=0..n-2} binomial(n-2,k) * a(k) * a(n-k-2).at n=10A337187
• Numbers p^2*q, p > q odd primes such that q does not divide p-1, and q does not divide p+1.at n=39A350421
• Numbers k such that sigma(k) = psi(k) + tau(k).at n=34A387953