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%I #60 Apr 18 2024 08:14:54
%S 0,0,1,7,16,43,105,255,646,1547,3605,8241,19279,44706,105212,246683,
%T 585355,1401644,3381806,8220777,20138200,49679870
%N Number of Carmichael numbers (A002997) less than 10^n.
%D Richard Pinch, Carmichael Numbers up to 10^20, ANTS 7.
%H Claude Goutier, <a href="http://www-labs.iro.umontreal.ca/~goutier/OEIS/A055553/">Text file readme.text summarizing enumeration of Carmichael numbers up to 10^22.</a>
%H Claude Goutier, <a href="/A055553/a055553.txt">Text file readme.text summarizing enumeration of Carmichael numbers up to 10^22.</a> [Local copy, with permission]
%H 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 Romeo Meštrović, <a href="http://arxiv.org/abs/1305.1867">Generalizations of Carmichael numbers I,</a> arXiv:1305.1867v1 [math.NT], May 4, 2013.
%H Richard G. E. Pinch, <a href="https://arxiv.org/abs/math/0504119">The Carmichael numbers up to 10^17</a>, arXiv:math/0504119 [math.NT], 2005.
%H Richard G. E. Pinch, <a href="http://www.chalcedon.demon.co.uk/rgep/p73.ps">The Carmichael numbers up to 10^{17}</a>, April 2005.
%H Richard G. E. Pinch, <a href="http://arXiv.org/abs/math/0604376">The Carmichael numbers up to 10^18</a>, arXiv:math/0604376 [math.NT], 2006.
%H Richard G. E. Pinch, <a href="http://www.chalcedon.demon.co.uk/rgep/publish.html#76">Carmichael numbers up to 10^18</a>, April 2006.
%H Richard G. E. Pinch, <a href="http://www.chalcedon.demon.co.uk/rgep/p82.pdf">The Carmichael numbers up to 10^21</a>, May 2007; <a href="http://www.tucs.fi/publications/insight.php?id=pErJuKaLe07a&table=proceeding">Proceedings of Conference on Algorithmic Number Theory 2007</a>. - _Charles R Greathouse IV_, Feb 01 2009
%H Richard G. E. Pinch, <a href="http://www.math.tu-berlin.de/~kant/ants/poster.html">ANTS 7 Posters</a>.
%H Andrew Shallue and Jonathan Webster, <a href="https://arxiv.org/abs/2401.14495">Advances in Tabulating Carmichael Numbers</a>, arXiv:2401.14495 [math.NT], 2024. [Appears to give an incorrect value for a(22). - _N. J. A. Sloane_, Apr 18 2024]
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/CarmichaelNumber.html">Carmichael Number</a>.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Pseudoprime.html">Pseudoprime</a>.
%Y Cf. A002997.
%K nonn,more,changed
%O 1,4
%A _Eric W. Weisstein_
%E Updates from Pinch's articles sent by _Charles R Greathouse IV_, Dec 04 2005, Jul 16 2006, May 29 2007
%E a(21) from Pinch's paper by _Charles R Greathouse IV_, Feb 01 2009
%E a(22) from Shallue and Webster (2024) added by _Amiram Eldar_, Feb 23 2024
%E a(22) = 49679870 reported by _Claude Goutier_ on Dec 28 2022 (see links). - _N. J. A. Sloane_, Apr 18 2024
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