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krishnanraman/gist:427ad599b68063c80e9a5fa76882d045

Created March 10, 2024 19:10
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gistfile1.txt
# Find x such that x+1, 2x+3,3x+5 and 4x+7 are prime.
library(DescTools)
# This works
subset(expand.grid(x=1:1000),IsPrime(x+1) & IsPrime(2*x+3) & IsPrime(3*x+5) & IsPrime(4*x+7))
# Alternate solution
which(mapply(function(x) IsPrime(x+1) & IsPrime(2*x+3) & IsPrime(3*x+5) & IsPrime(4*x+7), 1:1000))
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