4747505071domain: NAppears in sequencesa(n) = the least prime p such that (2*k + 1)*p - 2*k, k=1..n are all prime.at n=7A175566Numbers n with property that (2k+1)n-2k k=0..8 are all prime.at n=0A175568Numbers n with property that numbers (2k+1)n-2k k=0..7 are all prime.at n=16A175580