See also Online Encyclopedia of Integer Sequences (OEIS):
https://oeis.org/search?q=8647&language=english&go=Search
Or the Cinco Encyclopedia of Numbers https://youtube.com/watch?v=ZI3QxgjLGbQ
Thanks, Cinco
Or the Cinco Encyclopedia of Numbers https://youtube.com/watch?v=ZI3QxgjLGbQ
Thanks, Cinco