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This number is a composite.
Single Curio View: (Seek other curios for this number)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 15:29:29; Last Modified: 2021-10-13 17:38:31.
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