2124749677
This number is a prime.
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The prime-champion less than 2^32 (with 23 terms) formed by swapping of any two digits, one swap at a time: {2124749677, 1224749677, 4122749677, 7124249677, 9124742677, 6124749277, 7124749627, 2421749677, 2424719677, 2624749177, 2724749617, 2142749677, 2174249677, 2164749277, 2174749627, 2127449677, 2129744677, 2127749647, 2124479677, 2124649777, 2124794677, 2124779647, 2124747697}. [Rivera]
Submitted: 2020-07-13 13:14:13; Last Modified: 2020-07-13 13:30:45.
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