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1.
S₁: There is a touching story of Professor Hardy visiting Ramanujan as he lay desperately ill in hospital at Putney.
S₆: It is the lowest number that can be expressed in two different ways as the sum of two cubes."

P: "No Hardy, that is not a dull number in the very least.
Q: Hardy, who was a very shy man, could not find the words for his distress.
R: It was 1729.
S: The best he could do, as he got to the bedside was : "I say, Ramanujan,, I thought the number of the taxi I came down in was a very dull number.