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Summation of primes: Difference between revisions
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puts "The sum of all primes below 2 million is #{(0i64..2000000i64).select { |n| n if prime? n }.sum}."
#also
puts "The sum of all primes below 2 million is #{(0i64..2000000i64).sum { |n| prime?(n) ? n : 0u64 }}"
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