554535251
This number is a prime.
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554535251 is the smallest prime number formed by concatenating an
integer n > 1 with the alternating sequence n, n−1, n,
n−2, ..., n, 1. The next two such primes occur at n = 13
and n = 29. [Ahmed]
Submitted: 2026-06-20 09:10:41; Last Modified: 2026-06-20 11:02:19.
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