29

This number is a prime.

Just showing those entries submitted by 'Green': (Click here to show all)

+ The maximal number of regions into which a circle can be divided by 7 lines. [Green]

+ The membership of the Mathematical Association of America is divided into 29 regional sections. [Green]

+ The smallest prime p such that when its digits are rendered in the base p, the result is prime. In this case 29 (base 29) = 67. [Green]

+ All ZIP Codes in the state of South Carolina begin with the digits '29'. [Green]

+ Version 3 of the QR Code (Quick Response Code) uses a
29-by-29 array of black squares on a white background to
encode messages. QR Codes are often scanned by smart
phones for the purpose of linking to a website whose URL
is encoded in the array of black and white squares. [Green]

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

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