28290

Appears in sequences

• Partial sums of A000219.at n=16A091360
• Positions where A109890(n) = Sum_{i = 1..n-1} A109890(i).at n=38A111315
• Same as A007022, but with orientation-reversing isomorphisms forbidden.at n=18A113204
• Numbers k such that sigma(k) - phi(k) is a 4th power.at n=28A115918
• Number of integer-sided pentagons having perimeter n, modulo rotations but not reflections.at n=44A293822