Feeds:
Posts
Comments

Archive for February 27th, 2008

05a. [Saint-Petersburg 1998] Let d(n) denote the number of positive divisors of the number n. Prove that the sequence d(n^2+1) does not become strictly monotonic from some point onwards.

05b. PEN J11 Prove that d((n^2+1)^2) does not become monotonic from any given point onwards.

Read Full Post »