World!OfNumbers |
WON plate 59 | |
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[ Palindrome 21312 is another unique onewhen taken into consideration the following two rules : First, the digit zero may not appear in the palindromeSecondly, the sum of its digits equals the number of its prime factors21312 = 2 + 1 + 3 + 1 + 2 = 9 so there should exist nine prime factors !Indeed as 21312 = 2 x 2 x 2 x 2 x 2 x 2 x 3 x 3 x 37.Dear puzzlers, proof me wrong by finding a second solution...
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A000059 Prime Curios! Prime Puzzle Wikipedia 59 Le Nombre 59 Numberland 59 |

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