266221domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form (prime(k-1)+1)*(prime(k+1)-1) + 1, k>1.at n=20A087106Consider the array T(n, m) = m-th prime of the form n*i(i+1)/2 +/- 1. This sequence is the main diagonal.at n=28A125765Prime numbersat n=23331