29

This number is a prime.

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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]