This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A289258 #9 Jul 03 2017 08:03:51 %S A289258 3,19,163,1459,8803,17497,52489,78787,164617,370387 %N A289258 Prime factors of numbers in A289257. %C A289258 Kalmynin conjectures that this sequence is infinite. %C A289258 I have some doubts about terms 17497, 52489, 164617 that are == 1 (mod 8). %H A289258 Alexander Kalmynin, <a href="https://arxiv.org/abs/1611.00417">On Novák numbers</a>, arXiv:1611.00417 [math.NT], 2016. See Theorem 7 p. 11. %Y A289258 Cf. A006521, A057719, A124240, A289257. %K A289258 nonn,more %O A289258 1,1 %A A289258 _Michel Marcus_, Jun 29 2017