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%I #2 Mar 30 2012 18:41:15
%S 82,81,83,82,84,83,85,87,89,88,90,92,94,96,98,100,102,104,106,108,110
%N Number of protons in longest known radioactive decay series ending with Lead 207 ("actinium series"), reversed.
%C See comments in A080530, neutrons are in A080538.
%H C. Heilman, <a href="http://chemlab.pc.maricopa.edu/periodic/periodic.html">The Pictorial Periodic Table</a>
%F a(n)=A080530(n)-A080538(n).
%Y Cf. A080533, A080535, A080536.
%K nonn,hard
%O 0,1
%A _Ralf Stephan_, Feb 20 2003
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