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 A242435 #15 May 09 2021 02:16:49 %S A242435 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,2,6,2,7,8,6,12,11,21, %T A242435 24,27,35,45,68,86,117,176,206,260,370,457,565,750,967,1321,1531,1978, %U A242435 2842,3723,4587,5677,8354,10708,13435,17259,23040,31741,40146,48596,66728,92193,112771,149002,209890 %N A242435 Number of terms of A182116 between 2^n and 2^(n+1). %C A242435 This was done with data on Carmichael numbers below 10^21 provided by R. G. E. Pinch, and special computational assistance from William Stein. %C A242435 There are 16396564 Carmichael numbers below 2^69 but only 849752 have the property of A182116. It looks as though the ratio of Carmichael numbers of this type to normal Carmichael numbers converges to a value around 0.051. %H A242435 Richard Pinch, <a href="http://www.chalcedon.demon.co.uk/rgep/publish.html#82">Carmichael numbers up to 10^21</a> %Y A242435 Cf. A002997, A182116, A182108, A182490. %K A242435 nonn %O A242435 1,25 %A A242435 _Brad Clardy_, May 14 2014