For this, I think I would have gone with:
selPrime=: #~ 1&p:
seed=: selPrime digits=: 1+i.9
step=: selPrime@,@:(,&.(10x&#.inv)/&>)@{@;
digits&step&.>^:a: , wrote:
>
> based on Raul's rosettacode link, but building an expaning list of left
> truncable primes, such that further search i
props for using { catalogue and managing a &. application in your step function.
a design principle I was aiming for is a big strength of J. What I call a
"perfect function" defined as iterative form where output is of consistent
shape/meaning as input, and where ^: can be used "separately" to
Present: Art Anger, Devon McCormick, Raul Miller, and Bob Therriault
1) We looked at Art's index to the Essays which now includes difficulty levels.
https://code.jsoftware.com/wiki/Anger/Essays_Index Difficulty was assigned
subjectively and might be adjusted by other's input over time. Then a
d
