101

This number is a prime.

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Taipei 101 (pronounced "one oh one" in English) comprises 101 floors above ground. It is located in Xinyi District, Taipei, Taiwan. [Post]

The first odd prime for which the Mertens function M(n) = 0. [Post]

The smallest prime which requires a multidigit prime number of digits (base 10) and a prime number of chisel strokes as a sans serif Roman numeral. Curiously, this is true whether one considers "C" to be one stroke (a circular arc) or two strokes (like a left angle-bracket or less-than sign). [Post]