Solving Google Treasure Hunt Puzzle 4: Prime Numbers

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June 09, 2008, 17:08

Great! Thanks for the detailed explanantion. However, I am not familiar with awk, so will appreciate, if you can explain the following:

1. awk 'BEGIN { OFS="\n" } NR > 2 {print $1,$2,$3,$4,$5,$6,$7,$8}'

2. awk 'BEGIN { prev[0] = 0 } NR = '$N' { psum += prev[NR-'$N'];

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