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 A328936 #9 Apr 22 2024 08:12:10
%S A328936 4,11,25,63,134,268,508,1013,1901,3773,7208,13834,26353,50343,96122,
%T A328936 184354,354218
%N A328936 The number of imprimitive Carmichael numbers (A328935) below 10^n.
%C A328936 Granville and Pomerance conjectured that most Carmichael numbers are primitive, i.e. lim_{n->oo} a(n)/A055553(n) = 0.
%H A328936 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>.
%H A328936 Andrew Granville and Carl Pomerance, <a href="https://doi.org/10.1090/S0025-5718-01-01355-2">Two contradictory conjectures concerning Carmichael numbers</a>, Mathematics of Computation, Vol. 71, No. 238 (2002), pp. 883-908.
%H A328936 <a href="/index/Ca#Carmichael">Index entries for sequences related to Carmichael numbers</a>.
%e A328936 a(6) = 4 since there are 4 imprimitive Carmichael numbers below 10^6: 294409, 399001, 488881, 512461.
%Y A328936 Cf. A002997, A055553, A328935.
%K A328936 nonn,more
%O A328936 6,1
%A A328936 _Amiram Eldar_, Oct 31 2019
%E A328936 a(20)-a(22) calculated using data from _Claude Goutier_ and added by _Amiram Eldar_, Apr 22 2024