In each question, the first and the last sentences of the passage are numbered S1 and S6 respectively. The rest of the passage is split into four parts. These four sentences are jumbled. Read the sentences and identify their correct and logical order.

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S1: There is a touching story of Professor Hardy visiting Ramanujan as he lay desperately ill in hospital at Putney.
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 beside was "I say Ramanujan, I thought the number of taxi I came down in was a very dull number".
S6: It is the lowest number that can be expressed in two different ways as the sum of two cubes.
The Proper sequence should be: