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39 (another Prime Pages' Curiosity) |
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The least composite odd number that is the sum of the primes between its smallest and largest prime factors (39 = 3 x 13 = 3 + 5 + 7 + 11 + 13). [Rivera] Concatenating the 39th row numbers of Pascal's Triangle forms a prime. [Rivera] 39 is the smallest positive integer which cannot be formed from the first four primes (used once each), using only the simple operations +, -, *, / and ^. [Hartley] 100000^39 - 39 is prime. [Firoozbakht]
39 = 3*9 +
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