999969999

Appears in sequences

• Terms of A088753 that are not terms of A063048.at n=21A089521
• a(n) is the largest n-digit palindrome that is the product of two numbers having an equal number of digits, or 0 if no such palindrome exists.at n=8A308803
• a(n) is the largest (2n+1)-digit palindrome that is the product of two numbers having an equal number of digits.at n=4A327435
• a(n) = 10^(2n+1) - 1 - 3*10^n.at n=4A332196