55277

Appears in sequences

• Composite numbers n such that k! == 1 (mod n) for some k > 2.at n=37A049048
• Numbers n such that sigma (phi ( n ) ) = sigma (sigma (n ) ) where phi is Euler's totient and sigma is the multiplicative sum-of-divisors function.at n=26A065556
• Numerators of Blandin-Diaz compositional Bernoulli numbers (B^sin)_3,n.at n=6A132092
• Smallest i such that prime(n) divides gcd(sigma(i), phi(i)) (cf. A009223).at n=22A222714
• Numbers of the form p*q, p and q prime with q=2p-3.at n=22A226755