What is the greatest palindromic number less than 999?
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The greatest number is 123 because 300-176 is 124 but since it says less than, it is going to be 123.
The greatest prime number less than 20 is 19. Not sure what "then twice" is unless you are wanting to double it, which becomes 38.
There is no such number. For if you considered 49.99 to be such a number, then 49.995 is a greater number and it is less than 50. And then 49.9955 is even greater and still less than 50. This process can go on without end.
The three greatest whole numbers less than 200 that each have an odd number of factors are 144, 169 and 196.