Prime Curios!: 10213

10213
(another Prime Pages' Curiosity)

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Using 10213 as the starting term for the RATS algorithm: Reverse Add Then Sort the digits, leads to a 72 term sequence ending with the prime 5566666666666666666667777. This is the longest sequence produced for all starting integers < 20000 using the prime stopping criterion. [Earls]

Submitted: 2003-04-22 10:29:29; Last Modified: 2008-01-30 11:28:00.