38551

Appears in sequences

• a(n) = Sum_{d|n} phi(d^3).at n=38A068963
• Numbers k such that sigma(k) - phi(k) is a 4th power.at n=33A115918
• Terms of A177763 which have more than one such representation.at n=29A177766
• Least semiprime whose sum of prime factors equals 2^n.at n=9A193226
• Number of (n+1) X 3 0..1 matrices with each 2 X 2 subblock idempotent.at n=16A224544
• Numbers x such that x = concatenate(a, b) and phi(a) + phi(b) = sigma(x) - x.at n=12A254624
• a(n+1) = 2^(2*n - 1) + (-1)^n * a(n), a(1) = 1.at n=8A266238
• Number of non-isomorphic directed graphs reachable in n steps (and no fewer) by at least 2*n agents using the LNS protocol (see A307085).at n=8A383388