path: root/problem58.ijs

limit =: 20000
corners =: +/\1,4#2*1+i.limit
primeCounts =: +/\0,+/"1]1 p: (limit,4)$}.corners
primeRatios =: primeCounts % 1+4*i.limit+1
problem58 =: 1+2*1{I.primeRatios<0.1