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Old 2020-12-31, 10:05   #4
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

2·3·5·313 Posts
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Even so, quad table in compressed form is already available in A014561 above 10,000 terms. (with "5" easily added in front).
Triplet tables will take less than a split second to compute.

It is like expanding A008585 to 10,000 terms.
Or A008596.
There are so many more sequences that can be extended!
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