10301

This number is a prime.

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The smallest multidigit digit sequence in the quater-imaginary numeral system (first proposed by Donald Knuth) corresponding to a single digit prime, i.e. 5 in base 10, is a palindrome. [Harrison]

Submitted: 2021-09-07 15:00:49; Last Modified: 2026-06-29 13:25:50.