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Talk:Unprimeable numbers

From Rosetta Code

First 25 or 35?[edit]

Gerard, I notice that the task asks for the first 25 unprimeable numbers but Thundergnat and yourself have produced the first 35. I've assumed the latter is correct. --PureFox (talk) 18:30, 1 December 2019 (UTC)

Yes, I will change it ASAP.     -- Gerard Schildberger (talk) 18:55, 1 December 2019 (UTC)


off-by-one or output limited in REXX?[edit]

The REXX output example only shows the 34 first unprimes compared. Ends with 848 instead of the 890 the other examples output. Zino (talk) 03:34, 2 January 2020 (UTC)

Yuppers, I found the problem in the program, it was an incorrect comparison operator.   The program has been fixed, and the output updated.   Thanks for finding the omission.     -- Gerard Schildberger (talk) 05:16, 2 January 2020 (UTC)

Why is the first unprimeable ending in digit '1' 595631, and not 294001?[edit]

I'm looking at the output of debug which seems to suggests that 294,001 is unprimeable. And it is less than the value given by everyone else. Which of these is prime? What have I missed? --Tim-brown (talk) 17:52, 19 March 2020 (UTC)


unprimeables cannot themselves be prime. --Chunes (talk) 18:57, 19 March 2020 (UTC)
Thanks Chunes. Tim
Or put in another way,   unprimeables   must be composite.     -- Gerard Schildberger (talk) 02:34, 9 May 2020 (UTC)