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The smallest prime whose sum of digits is a square. [Gupta] A concatenation of the first two triangular numbers. [Gupta] The sum of first 13 prime numbers is 238 (whose sum of digits is 13). [Gupta] The smallest prime that can be expressed as the sum of two primes (2 + 11) and two composites (4 + 9) in only one way. [Gupta] (13) = 1! * 3!. [Gupta] Currently (between the years 1901 and 2099) the Julian calendar is 13 days behind the Gregorian calendar. [Gupta] A February 'Friday the 13th' in a leap year occurs just 13 times within a 400year period. [Gupta]
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