61431domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 1, 3, 4, 6 and 7.at n=17A137025Decimal values of the antidiagonals of the Sierpinski carpet considered as binary numbers.at n=15A292689a(n) is the least k such that A342956(k) = n.at n=13A342957