Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in require_once() (line 341 of /home/n9esbwprkar5/public_html/domains/circles/includes/module.inc).

Explore the surprising variations in conceptually simple sequences of numbers, constructed by applying one of two operations to generate each successive term. Can you make the sequence return to its starting value?