MathDB
Find all sequences

Source: Baltic Way 2002

November 13, 2010
inductionlogarithmsalgebra proposedalgebra

Problem Statement

Find all sequences 0a0a1a20\le a_0\le a_1\le a_2\le \ldots of real numbers such that am2+n2=am2+an2a_{m^2+n^2}=a_m^2+a_n^2 for all integers m,n0m,n\ge 0.