Answer more than 30 days after a question was asked as first answer scoring 2 or more. This badge can be awarded multiple times.
earned this badge 2 times
Generalizing Ramanujan's proof of Bertrand's Postulate: Can Ramanujan's approach be used to show a prime between $4x$ and $5x$ for $x \ge 3$
Awarded Dec 22 '13 at 8:09
Awarded Jan 10 '11 at 6:26