retroforth/example/Primes.forth

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This is a quick and dirty way to find prime numbers in a set.
````
{{
#2 'last var<n>
:extract (s-s)
[ @last dup-pair eq?
[ drop-pair TRUE ]
[ mod n:-zero? ] choose ] set:filter ;
---reveal---
:get-primes (s-s)
#2 !last
dup fetch [ extract &last v:inc ] times ;
}}
````
And a test:
````
here
#7500 ,
#2 #7502 [ dup , n:inc ] times drop
get-primes [ putn sp ] set:for-each
````