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%I #14 Dec 11 2019 05:10:13
%S 0,0,1,11,34,107,312,882,2457,6504,17206,46073,123868,334567,915443,
%T 2520503,7002043,19604493,55264235
%N Number of semiprime Fermat pseudoprimes to base 2 (A214305) less than 10^n.
%H Jan Feitsma, <a href="http://www.janfeitsma.nl/math/psp2/statistics">The pseudoprimes below 2^64 - statistics</a>.
%H William F. Galway, <a href="https://faculty.math.illinois.edu/~galway/SlidesETC/pq-psp-slides.pdf">The Density of Pseudoprimes with Two Prime Factors</a>.
%H Aran Nayebi, <a href="https://arxiv.org/abs/0906.3533v21">On the distribution of Carmichael numbers</a>, arXiv preprint arXiv:0906.3533 [math.NT], 2009-2013. But beware of errors!
%Y Cf. A055550, A214305.
%K nonn,more
%O 1,4
%A _Amiram Eldar_, Mar 05 2018
%E Corrected and extended by _Daniel Suteu_, Dec 10 2019
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