Solving Google Treasure Hunt Puzzle 4: Prime Numbers

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Paolo Bonzini Permalink
June 08, 2008, 23:29

I used more or less the same approach as you to sum the primes, up to using awk and "delete a[NR-41]". :-) I used "tr -s" instead to split the files to one prime per line. And I used "fgrep -xf" to compute the intersections of the files, which is probably slower than sorting and using uniq.

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