Revision history of "nth centered nonagonal number" (Z15470)
Okutoora kw'ekibaganizibwa: Toonyeza amapeesa ga rediyo g'empindura kulengesaniza, miga ipeesa lya taahamu rundi lya hansi.
Ensoborra: (hati) = embaganiza y'oruhindura orwongeraho, (kara) = embaganiza y'oruhindura orurugaho, n = ekihingisibwa kitaito.