500950domain: NAppears in sequencesa(n) = T(2*n+1, n+3), T given by A027935.at n=9A027943Partial sums of A014166.at n=18A053739Numbers k such that k and k^2 use only the digits 0, 2, 5, 8 and 9.at n=44A136919Numbers k such that k and k^2 use only the digits 0, 2, 5 and 9.at n=32A136920