A366609 Smallest prime dividing 4^n + 1.

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

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