51174

Appears in sequences

• Numbers n such that pi(n) = prime(d_1)*prime(d_2)*...*prime(d_k) where d_1 d_2 ... d_k is the decimal expansion of n.at n=3A098683
• Numbers n such that pi(n) = prime(d_1)*prime(d_2)* ... *prime(d_k), where d_1, d_2, ... d_k is the decimal expansion of n, and the zeroth prime is 1.at n=6A160040
• If A319303(k) = n for some k, then a(n) = k, else a(n) = -1.at n=38A322521
• Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x^3) )^n.at n=8A370196