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 A225005 #21 Apr 21 2024 09:59:32 %S A225005 0,0,0,0,0,0,0,0,0,1,3,5,6,9,10,15,19,23,33,45,55,69,95,130,162,214, %T A225005 290,375,483,656,864,1118,1446,1874,2437,3130,4058,5188,6642,8521, %U A225005 11002,14236,18400,23631,30521,39376,50685,65590,84817,109857,141892,183507,237217,307278,398506,517446,672105,873109,1136472,1479525,1927138,2513234,3278553,4279356 %N A225005 Number of Carmichael numbers (A002997) less than 2^n. %H A225005 Amiram Eldar, <a href="/A225005/b225005.txt">Table of n, a(n) for n = 1..73</a> (terms 65..69 added using A182490; terms 70..73 calculated using data from Claude Goutier) %H A225005 Jan Feitsma, <a href="https://web.archive.org/web/20220921163531/http://www.janfeitsma.nl/math/psp2/statistics">The pseudoprimes below 2^64 - statistics</a>. [Wayback Machine link] %H A225005 Jan Feitsma and William Galway, <a href="http://www.cecm.sfu.ca/Pseudoprimes/index-2-to-64.html">Tables of pseudoprimes and related data</a>. %H A225005 Claude Goutier, <a href="http://www-labs.iro.umontreal.ca/~goutier/OEIS/A055553/">Compressed text file carm10e22.gz containing all the Carmichael numbers up to 10^22</a>. %Y A225005 Cf. A002997, A055553, A208276, A108797. %Y A225005 Partial sums of A182490. %K A225005 nonn %O A225005 1,11 %A A225005 _Max Alekseyev_, Apr 23 2013