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added 141 characters in body

edited Jan 24, 2017 at 7:18

Bash + GNU utilities, (削除) 86 (削除ここまで) 85 bytes

for((k=4;k<1ドル;k++,j=k-2)){ [ `factor $k $j|wc -w` = 4 ]&&x=$x+1/$k+1/$j;};bc -l<<<0$x

Constructs a large arithmetic expression and then feeds it to bc -l to evaluate it.

Edit: Mistakenly left in a $(...) pair from an old version with nested command substitution; changed to backticks to save a byte.

answered Jan 24, 2017 at 3:56