a3 + b3
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You get the sum of 11 two ways; 5,6 and 6,5.
23 = 8, 33 = 27. Sum 35, difference 19...
According to Ramanujan, it's the lowest number that can be expressed in two different ways as the sum of two cubes (the cubes of 12 and 1; the cubes of 10 and 9). It 's the answer.