353133

Appears in sequences

• Numbers n such that sigma(n) = 3*phi(n).at n=12A068391
• Numbers k such that sigma(k) = phi(k*bigomega(k)).at n=32A068400
• Numbers n such that sigma(n) = phi(3n).at n=19A074891
• Numbers k such that gcd(sigma(k), phi(k)) (A009223) attains record values.at n=39A222711