Created
March 10, 2024 19:10
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| # 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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