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Just showing those entries submitted by 'Poo Sung': (Click here to show all) The number of points and lines on the minimal finite projective (or Fano) plane. [Poo Sung]De Morgan suspected Shanks's calculation of up to 707 digits was wrong because of the lack of 7s contrary to other digits. [Poo Sung] (77 + 777)/(7 + 7) = 61 is prime. Note that seven 7's are used and 6 + 1 = 7. [Poo Sung] There is a persistent rumor that the philosopher G.W.F. Hegel (17701831) provided a logical proof within his doctoral dissertation that there could only be 7 planets in the solar system. [Poo Sung] The first exotic differentiable structure was a 7dimensional hypersphere. It was found by Milnor (1956) using the calculus of octonions. [Poo Sung] 7 is the smallest number that cannot be represented as a sum of 3 squares. [Poo Sung] The game Tetris uses 7 onesided tetrominoes (referred to as I, J, L, O, S, T, and Z). [Poo Sung] 7 = 98532/14076 is the unique pandigital fraction expression including 0. [Poo Sung]
(There is one curio for this number that has not yet been approved by an editor.)
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