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The smallest triangular number such that the sum of its digits cubed is prime. Note that 496 is the third perfect number. [Earls] 496 is equal to the alternating sum and difference of the squares of the integers from 1 to 496's largest prime factor. [Ohlson] 496^496 + 496! + 496/496 is a 1337digit prime. [Firoozbakht] The smallest perfect number such that the sum of its digits is prime: 4 + 9 + 6 = 19. [Pol]
(There are 3 curios for this number that have not yet been approved by an editor.) To link to this page use http://primes.utm.edu/curios/page.php?number_id=288
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