47538

Appears in sequences

• Cycle of 3 steps possible for 'concatenate a(n) and nextprime(a(n)) is a prime'.at n=8A034593
• a(n) = [x^n] (1/(1 - x - x^2/(1 - 2*x - 2*x^2/(1 - 3*x - 3*x^2/(1 - 4*x - 4*x^2/(1 - ...))))))^n.at n=7A292871