27000000000domain: NAppears in sequencesCubes whose digit reversal is a powerful(1) number (A001694).at n=25A115694Numbers k such that k and k^2 use only the digits 0, 2, 3, 7 and 9.at n=31A136895Numbers k such that k and k^2 use only the digits 0, 2, 7 and 9.at n=10A136926