216816

Appears in sequences

• a(n)-th prime is the smallest prime containing exactly n 9's.at n=6A037070
• Number of primes less than 100000n.at n=29A038814
• Number of primes less than n*10^6.at n=2A038815
• a = a(n) is such that the a-th prime p(a) is the least prime with digital sum equal to n, or a(n)=0 if no such prime exists.at n=55A104290
• Number of n-digit squares with no zero digits, having roots containing at least one zero.at n=12A104317
• G.f. = Phi^3*F^3, where Phi = g.f. for A028930, F = g.f. for A028959.at n=22A328534