21361
This number is a composite.
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The only known Bell
pseudoprime and likely to be the only one in near
future. A Bell pseudoprime is a composite number n such
that nth Bell number is congruent to 2 (mod n),
a property satisfied by all primes. [Gudipati]
Submitted: 2026-04-04 12:45:08; Last Modified: 2026-04-04 14:24:06.
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