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Nordic MC 2006 Q3

Source:

March 3, 2013
number theory unsolvednumber theory

Problem Statement

A sequence (an)(a_n) of positive integers is defined by a0=ma_0=m and an+1=an5+487a_{n+1}= a_n^5 +487 for all n0n\ge 0. Find all positive integers mm such that the sequence contains the maximum possible number of perfect squares.