100030001

This number is a prime.

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100030001 remains prime after deleting a zero simultaneously in each wing, i.e., 100030001, 1003001, 10301, and 131. Finally, 1+3+1 is also prime. [Marcel]

Submitted: 2025-10-24 06:56:09; Last Modified: 2026-01-26 17:28:43.