Is it possible to arrange 1400 positive integer ( not necessarily distinct ) ,at least one of them being 2021 , around a circle such that any number on this circle equals to the sum of gcd of the two previous numbers and two next numbers? for example , if a,b,c,d,e are five consecutive numbers on this circle , c=gcd(a,b)+gcd(d,e) number theorycombinatoricsgreatest common divisor