login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A080535 Number of protons in longest known radioactive decay series ending with Lead 208 ("thorium series"), reversed. 5

%I

%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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 6 22:42 EST 2021. Contains 349567 sequences. (Running on oeis4.)