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I'm looking at the class record algorithm here. I understand how some of the numbers (e.g. 8*k+5) can be skipped because they join with a lower number. But I don't understand exactly how the sieve of 2^25 elements that he refers to is constructed or used.

How exactly would one build the sieve and use it when calculating class records?

Thomas Johnson
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    You could check this post https://math.stackexchange.com/questions/3454674/calculate-the-maximum-in-the-collatz-sequence there are also some code in it (https://github.com/xbarin02/collatz-sieve) – Collag3n Aug 31 '21 at 06:13

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