519512471
This number is a prime.
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The smallest prime p where no digit change results in a prime, with the sole exception of its twin prime partner (p+2). The only prime which can be formed by changing a digit of 519512471 is 519512473. [Gudipati]
Submitted: 2026-04-11 00:21:58; Last Modified: 2026-04-11 00:38:53.
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