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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Summarize-primes/J/summarize-primes.j Normal file
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primes=: p: i. _1 p: 1000 NB. all prime numbers below 1000
sums=: +/\ primes NB. running sum of those primes
mask=: 1 p: sums NB. array of 0s, 1s where sums are primes
NB. indices of prime sums (incremented for 1-based indexing)
NB. "copy" only the final primes in the prime sums
NB. "copy" only the sums which are prime
results=: (>: I. mask) ,. (mask # primes) ,. (mask # sums)
NB. pretty-printed "boxed" output
output=: 2 1 $ ' n prime sum ' ; < results