25870

Appears in sequences

• Numbers k such that sigma(k) = 2*phi(k+1).at n=18A068423
• Sum of the first n weird numbers.at n=5A125114
• Number of (n+2)X(1+2) nonnegative integer arrays with all values the knight distance from the upper left minus as much as 1, with successive minimum path knight move differences either 0 or +1, and any unreachable value zero.at n=10A253417