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Old 2017-11-01, 18:45   #4
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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I am sure that this has already been done and discussed on this forum. (1e6 to 2e6 range)

One just needs to carefully read this subforum. If it sounds like work, - yes. It. Is! With careful reading one can save CPU years.

If you still want to do it from scratch, then you need to take a snapshot of all <106 sequence's endpoints and check if/when your new sequence merges - immediately. It is extremely easy to do with FactorDB REST call (e.g. http://factordb.com/sequences.php?se...02&action=last , parse and check against known endpoints. Done!). Then such merges to be added to a separate table to be posted some place in this forum, but not to be exposed it in the system.You will have a few percent of all even numbers surviving this simple procedure.
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