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In 1917, Ramanujan gave a short
list of odd numbers which cannot be written as x^{2} + y^{2} + 10z^{2}. Eighty years later it is was shown that 2719 is surely the largest such number (GRH). Did you notice 2719 is a permutation of the HardyRamanujan number? [Ono1997] [Beedassy]
(There is one curio for this number that has not yet been approved by an editor.)
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