Prime number checker

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ArcusVonSinus
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Prime number checker

Post by ArcusVonSinus »

I made a circuit computer, which determines if the number of all items in a chest is a prime number, then it will light up green. Otherwise it will light up red. The power pole is just to indicate where is the index which goes from 2 to the number of items (the largest among all sorts of them).

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https://factorioprints.com/view/-L2qdWZACpEIgd6i-7Ex
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DaveMcW
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Re: Prime number checker

Post by DaveMcW »

Here is a smaller and faster version, using the new "modulo Each" operator. It works for up to 160,000 items.



prime.jpg
prime.jpg (84.07 KiB) Viewed 1664 times
Last edited by DaveMcW on Fri Mar 26, 2021 11:33 am, edited 1 time in total.
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ArcusVonSinus
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Re: Prime number checker

Post by ArcusVonSinus »

Nice!
Mine works itemwise, it checks if there is a prime amount of every item. But it is much slower :-)
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