423657

Appears in sequences

• Numbers n such that sigma(n) = 3*phi(n).at n=13A068391
• Numbers k such that sigma(k) = phi(k*bigomega(k)).at n=35A068400
• Numbers n such that sigma(n) = phi(3n).at n=20A074891
• Numbers k such that gcd(sigma(k), phi(k)) (A009223) attains record values.at n=40A222711
• Number of nX3 0..1 arrays with every element unequal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=15A304699