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(just those submitted by Gupta)
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+ The sum of primes up to 13 is equal to the 13th prime. [Gupta]

+ 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]

+ pi(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 400-year period. [Gupta]

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

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