Given a periodic sequence (with period $p$) of real numbers $(a_n)_{n\in\mathbb{N}}$, with each $a_n$ expressible individually in closed-form. Is it always possible to give a single closed-form expression, in terms of $n$, that expresses all the $a_n$'s?
2026-03-31 07:29:14.1774942154
Closed-form expressions for periodic sequences
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