# 61

This number is a prime.

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The great Topologist John Milnor had his conjecture
disproved by M. Mahowald, who found S(61), the set of all
oriented diffeomorphism classes of closed smooth homotopy
61-spheres is the trivial group. Reference: "Differential
Toplogy Forty-Six Years Later", John Milnor, Notice of the
AMS, June/July 2011, pp.804-809. [Post]
Submitted: 2011-07-23 16:15:01; Last Modified: 2011-08-31 08:00:52.

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