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+ Seven is the only odd prime that becomes "even" by deleting a letter. [Beedassy]

+ In most Hindu marriages the bride follows the groom 7 times around the holy fire, which is called a Saptapadi. [Das]

+ Whilst every Fibonacci prime number has odd prime subscript, 7 is the first prime not appearing in the Fibonacci sequence. [Beedassy]

+ The smallest prime NSW number. [Beedassy]

+ It is possible to construct an angle of pi/7 using 7 matchsticks. [Beedassy]

+ The smallest prime subscript n such that pn+1 is the first prime dividing #pn+1, (pn being the nth prime ). [Beedassy]

+ The normal human head bears 7 sense organ openings: 2 eye sockets, 2 ear canals, 2 nostrils, and a mouth. [Beedassy]

+ The largest known prime p such that p! + 1 is the square of a prime. [Beedassy]

+ The only odd prime p whose n-th power pn, for any nonzero n below p, has exactly n digits. [Beedassy]

+ The number of distinct four of fewer face-joined unit cubes forming the polycube pieces of the 3-by-3-by-3 Soma cube dissection puzzle invented by Piet Hein in 1936. [Beedassy]

+ The only known number whose factorial has 50% of its digits consisting of 0's: 7! = 5040. [Beedassy]

+ H-7 is the heaviest isotope of hydrogen observed experimentally in a heavy particle accelerator. [Beedassy]

(There are 15 curios for this number that have not yet been approved by an editor.)




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