Are there any other ways of decomposing 1/11 into sum of two unit fractions? In how many ways can we write 1/60 ass a sum of two unit fractions? More generally, in how many ways can the unit fraction 1/n be written as the sum of two unit fractions? In other word, how many ordered pairs (a, b) of positive integers a, b are there for which                                  1/n = 1/a + 1/b?

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