19968...86991 (499-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

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The largest known palindromic prime when turned upside down becomes a semiprime, as of January 2024. [Kalogeropoulos]

Submitted: 2024-02-25 02:24:41; Last Modified: 2024-03-02 03:58:01.

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