74313domain: NAppears in sequencesa(n) = n*(4*n^6 + 70*n^4 + 196*n^2 + 45)/315.at n=9A099193Least positive integer k such that both k and k*n belong to the set {m>0: 2*prime(prime(m))+1 = prime(p) for some prime p}.at n=12A261362Crystal ball sequence for the lattice C_7.at n=4A305721