702703domain: NAppears in sequencesa(n) = sqrt(A084004(n)).at n=28A084005Numbers A such that the square of concatenation AA is of form NNMM.at n=33A107677Integers m such that for every integer k>0, m*6^k+1 has a divisor in the set { 7, 13, 31, 37, 97 }.at n=2A244549