498420

Appears in sequences

• a(1) = a(2) = 1; for n > 2, a(n) = (a(1), a(2), a(3), ...) dot (P(1), P(2), P(3), ...); P = A000129.at n=6A159640
• Numbers n such that sigma(n) = 14*phi(n) (where sigma=A000203, phi=A000010).at n=19A171259
• Numbers n such that n = concatenate(a, b) and sigma(a) + sigma(b) = phi(n).at n=21A249065