66125

Appears in sequences

• Numbers that factorize into a prime number of factors all raised to different prime exponents and no number appears both as an exponent and as a prime factor.at n=19A114131
• Numbers m such that sigma(sigma(m))/m is a square.at n=33A318084
• Numbers k such that k, k^2-1 and k^2+1 are all fine, where a number m is fine if its prime factors are all less than m^(1/3).at n=15A345896
• E.g.f. satisfies A(x) = 1 + x*exp(x)*A(x)^3.at n=5A364983