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April 14, 2016 04:50
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require 'prime' | |
def gap(g, m, n) | |
(m..n).each{ |i| | |
#puts "i: #{i} i+g: #{i+g}" | |
if Prime.prime?(i) && Prime.prime?(i+g) | |
puts "primes found, stepping" | |
(i+1..i+g-1).each{ |j| | |
#puts "i: #{i} j: #{j}" | |
if Prime.prime?(j) | |
puts "inner prime found, abort" | |
return nil | |
end | |
} | |
return [i, i+g] | |
end | |
} | |
return nil | |
end | |
TESTS: | |
Test.assert_equals(gap(10,300,400), [337, 347]) | |
OUTPUT | |
i: 300 i+g: 310 | |
i: 301 i+g: 311 | |
i: 302 i+g: 312 | |
i: 303 i+g: 313 | |
i: 304 i+g: 314 | |
i: 305 i+g: 315 | |
i: 306 i+g: 316 | |
i: 307 i+g: 317 | |
primes found, stepping | |
i: 307 j: 308 | |
i: 307 j: 309 | |
i: 307 j: 310 | |
i: 307 j: 311 | |
inner prime found, abort | |
Expected: [337, 347], instead got: nil |
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