147167domain: NAppears in sequencesn-th 4k+1 prime times n-th 4k-1 prime.at n=37A048630Area of consecutive Prime-Indexed Prime rectangles.at n=20A119658a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(3*k+1,k).at n=7A390541