113543domain: NAppears in sequencesa(n) = T(2n-1,n-2), T given by A026747.at n=7A026752a(n) is the sum of the terms of the symmetric square array defined by M(i,j) = prime(i)+i-j for i >= j and M(i,j) = M(j,i) if i < j.at n=33A308731