A080535 - OEIS

%I #2 Mar 30 2012 18:41:15

%S 82,81,83,82,84,86,88,87,89,88,90,92,94,96,98,100,101,103,105,107,109,

%T 111

%N Number of protons in longest known radioactive decay series ending with Lead 208 ("thorium series"), reversed.

%C See comments in A080531, neutrons are in A080539.

%H C. Heilman, <a href="http://chemlab.pc.maricopa.edu/periodic/periodic.html">The Pictorial Periodic Table</a>

%F a(n)=A080531(n)-A080539(n).

%Y Cf. A080533, A080534, A080536.

%K nonn,hard

%O 0,1

%A _Ralf Stephan_, Feb 20 2003