Is it true that for any polynomial $P$ of degree $\geq 1$ with coefficients in $\mathbb{N}$, and any positive integer $a$, the sequence defined by $a_0=a,$ $a_{n+1}=P(a_n)$ contains infinitely many composite numbers?
2026-04-05 14:42:30.1775400150
Composite numbers among a sequence
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