284229

Appears in sequences

• a(n) = least k such that GCD of sigma(k) = A000203(k) and phi(k) = A000010(k) equals n-th primorial = A002110(n).at n=4A081397
• Integer quotients of k^2 by the sum of the prime distinct divisors of k^2+1, where k = A196219(n).at n=13A196220
• a(n) = Sum_{k=1..n} k * lcm(k,n).at n=32A344508
• Number of fixed tree-like polyedges on the square lattice with n edges, rooted at a vertex.at n=8A385120