3138345

Appears in sequences

• a(n) = 3*a(n-1) - 3*a(n-2) + 3*a(n-3), with a(0)=1, a(1)=3, a(2)=1.at n=23A136297
• Numbers n such that rad(sigma(n)) = 2*rad(n), where the "radical" of n, rad(n), is A007947 and sigma(n) is the sum of the divisors of n.at n=7A238330
• Numbers k for which A065330(k) = A065330(sigma(k)).at n=30A336458
• Numbers whose numerator and denominator of the harmonic mean of their divisors are both 3-smooth numbers.at n=25A348867