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 A382861 #7 Apr 13 2025 16:14:51 %S A382861 4,14,65,429,3804,37216,371464,3702470,36999540,369917405 %N A382861 Number of even Ulam numbers <= 10^n. %C A382861 The percentage of even Ulam numbers is decreasing from 66.66667% (for N = 10) to 50.00038% (for N = 10^10) and approaching 50%. %H A382861 Shyam Sunder Gupta, <a href="https://doi.org/10.1007/978-981-97-2465-9_18">Ulam Numbers</a>. In: Exploring the Beauty of Fascinating Numbers. Springer Praxis Books(). Springer, Singapore, (2025). %Y A382861 Cf. A002858, A307331, A382798, A382860. %K A382861 nonn,more %O A382861 1,1 %A A382861 _Shyam Sunder Gupta_, Apr 07 2025