%I A080538
%S A080538 125,126,128,129,131,132,134,136,138,139,141,143,145,147,149,151,153,
%T A080538 155,157,159,161
%N A080538 Number of neutrons in longest known radioactive decay series ending with 
               Lead 207 ("actinium series"), reversed.
%C A080538 See comments in A080530, protons are in A080534.
%H A080538 C. Heilman, <a href="http://chemlab.pc.maricopa.edu/periodic/periodic.html">
               The Pictorial Periodic Table</a>
%F A080538 a(n)=A080530(n)-A080534(n).
%Y A080538 Cf. A080537, A080539, A080540.
%Y A080538 Sequence in context: A030668 A030678 A028939 this_sequence A104233 A046759 
               A115938
%Y A080538 Adjacent sequences: A080535 A080536 A080537 this_sequence A080539 A080540 
               A080541
%K A080538 nonn,hard
%O A080538 0,1
%A A080538 Ralf Stephan (ralf(AT)ark.in-berlin.de), Feb 20 2003