64644

Appears in sequences

• 4-almost primes with semiprime digits (digits 4, 6, 9 only).at n=36A111496
• a(n) = A014486(A122231(n)).at n=5A122232
• Deep factorization of n, A300560, converted from binary to decimal. (Binary digits obtained by recursively replacing each factor p^e with [primepi(p) [e]], then '[' = 1, ']' = 0.)at n=18A300561