888808888domain: NAppears in sequencesSolutions y to x/SOD(x) = y, where x and y are palindromes.at n=23A276144a(n) = 8*(10^(2n+1)-1)/9 - 8*10^n.at n=4A332180The smallest palindrome with exactly n circular loops (or holes) in its decimal representation.at n=17A337842