%I #2 Mar 30 2012 18:41:15
%S 125,126,128,129,131,132,134,136,138,139,141,143,145,147,149,151,153,
%T 155,157,159,161
%N Number of neutrons in longest known radioactive decay series ending with Lead 207 ("actinium series"), reversed.
%C See comments in A080530, protons are in A080534.
%H C. Heilman, <a href="http://chemlab.pc.maricopa.edu/periodic/periodic.html">The Pictorial Periodic Table</a>
%F a(n)=A080530(n)-A080534(n).
%Y Cf. A080537, A080539, A080540.
%K nonn,hard
%O 0,1
%A _Ralf Stephan_, Feb 20 2003
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