29

This number is a prime.

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+ In the ddmmyyyy date format, there are 29 palindromic dates in 21st century, beginning: 10 February 2001 (10022001), 20 February 2002 (20022002), 1 February 2010 (01022010), 11 February 2011 (11022011), and 21 February 2012 (21022012). [Post]

+ There are 29 words in what Gauss wrote to Bessel on April 9, 1830: "we must in humility admit that if number is merely a product of our minds, space has a reality outside our minds whose laws we cannot a priori state." [Post]

+ Smallest prime number of different topologies (or quasi-orders or transitive digraphs) with n labeled elements (case n = 3). [Post]

(There is one curio for this number that has not yet been approved by an editor.)

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