61

This number is a prime.

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The smallest prime number with only one "6" that converts to a semiprime if the 6 is changed to a 9. The sequence begins 61, 269, 463, 601, etc. See PC10000...14363 (1000-digits). [Jeremy]

Submitted: 2020-07-13 20:38:36;   Last Modified: 2020-07-16 06:23:44.
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