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Legendre's proof relating to Hexagonal Numbers and the significance of the number 1791 has been improved upon by Duke and Schulze-Pillot (1990) to just three hexagonal numbers for every sufficiently large integer.

There are 13 positive integers within the range 5 to 130 that cannot be represented by only 4 hexagonal numbers. Only the integers 11 and 26 require 6 hexagonal numbers.

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