8

This number is a composite.

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8 is the last digit to appear in both a prime number and its prime index, first appearing in 787 and 138. The other 9 digits all first appear in smaller prime-prime index pairs. [Gaydos]

Submitted: 2019-09-29 13:47:52;   Last Modified: 2019-09-29 16:31:34.
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