The Number

1729

I remember once going to see him when he was ill at Putney. I had ridden in taxi cab number 1729 and remarked that the number seemed to me rather a dull one, and that I hoped it was not an unfavorable omen.

No,” he replied, “it is a very interesting number; it is the smallest number expressible as the sum of two cubes in two different ways”

— G. H. Hardy

Euler Function on the Complex Plane

Yep, it is ALSO the first absolute Euler pseudoprime.  Unique.  Sui Generis.

raman

  Just like The Man Who Knew Infinity:
 Srinivasa Ramanujan:   Sui Generis

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