49842

Appears in sequences

• Numbers k such that Sum_{d|k} sigma(d)/d is an integer.at n=8A068986
• Numbers n such that sigma(n) = 8*phi(n).at n=14A104901
• Numbers k such that if you subtract k-reversed from k you get a natural number with the same digits as k.at n=14A121969
• Numbers k such that k and k^2 use only the digits 2, 4, 6, 8 and 9.at n=18A137104
• a(n) = (2*n^3 + 5*n^2 - 3*n)/2.at n=35A162256