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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A366609 Smallest prime dividing 4^n + 1. 8 2, 5, 17, 5, 257, 5, 17, 5, 65537, 5, 17, 5, 97, 5, 17, 5, 641, 5, 17, 5, 257, 5, 17, 5, 193, 5, 17, 5, 257, 5, 17, 5, 274177, 5, 17, 5, 97, 5, 17, 5, 65537, 5, 17, 5, 257, 5, 17, 5, 641, 5, 17, 5, 257, 5, 17, 5, 449, 5, 17, 5, 97, 5, 17, 5, 59649589127497217 (list; graph; refs; listen; history; text; internal format) OFFSET 0,1 LINKS Max Alekseyev, Table of n, a(n) for n = 0..1983 CROSSREFS Bisection of A002586. Cf. A002586, A038371, A052539, A074476, A274903, A366605, A366606, A366607, A366608, A366670, A366671, A366719. Sequence in context: A358004 A115894 A033835 * A178198 A005529 A259255 Adjacent sequences: A366606 A366607 A366608 * A366610 A366611 A366612 KEYWORD nonn AUTHOR Sean A. Irvine, Oct 14 2023 STATUS approved

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Last modified August 18 17:05 EDT 2024. Contains 375269 sequences. (Running on oeis4.)