19999998

Appears in sequences

• Number of nonzero palindromes less than 10^n.at n=13A050250
• Numbers k such that 4*k-1 is the digit reversal of k-1.at n=10A083812
• a(n) = 2*(10^n - 1).at n=7A086573
• a(n) = smallest non-palindromic number k such that the Reverse and Add! trajectory of k joins the trajectory of A089521(n).at n=10A089522
• a(n) is the smallest k that is equal to the sum of the digits of k*(k+1)*...*(k+n-1) in base 10^n, or -1 if such a number does not exist.at n=6A308408