9425161

This number is a prime.

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An interesting property of the set {9, 4, 25, 16, 1} formed from 1² through 5². Any two adjacent squares sum to a prime, and their concatenation is also a prime. [Gudipati]

Submitted: 2026-02-05 13:01:49; Last Modified: 2026-02-05 13:41:58.