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[ September 12, 1999 ] Palindrome  93639  is as far as I know a very unique one.
All we need to perform is adding to it the sum of its prime factors.
This gives the ending prime 93683.
( Note : sometimes more iterations are needed to reach an ending prime.)
93639 + 3 + 7 + 7 + 7 + 7 + 13 = 93683
The uniqueness exists therein that there is NO OTHER PRIME between 93639 and 93683 !
It is easily stated of course, so can you find a second palindrome with this property ?

[ Visit and participate also Carlos Rivera's   Puzzle #66.]

A000060 Prime Curios! Prime Puzzle
Wikipedia 60 Le Nombre 60 Numberland 60














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