It's perhaps worth noting that these do not always yield the same result:
q2 5 7 11 13
6
q3 5 7 11 13
4
FYI,
--
Raul
On Sun, Feb 21, 2021 at 6:10 PM xash <xash@λ.land> wrote:
>
> Without I.:
> q2=: (1r4 3r4 <.@* #) -/@:{ \:~
>
> And a fun one:
> q3=: \:~ -&({~ # <.@% 4:) /:~
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