953674316406domain: NAppears in sequencesa(n) = (5^n - 1)/4.at n=18A003463Row sums in A112668.at n=17A110737a(n) = (5^(2*(n + 1)) - 1)/4.at n=7A275766Oblong numbers that are repdigits with length > 2 in more than two bases.at n=4A309062