407484

Appears in sequences

• Integers of the form Sum_{i=1..m} phi(i)/gcd(m,i).at n=22A066970
• a(n) is the square of the side length of a simplex whose n-dimensional inner hypervolume is equal to its (n-1)-dimensional surface hypervolume. As a result, the sequence starts at n=2.at n=19A364922