[seqfan] A159580 easy, more

sean sean at realtimegenomics.com
Fri Sep 30 11:01:10 CEST 2011

A159580 is one of the sequences listed easy,more. It seems to be derived 
somehow from A159577. But after studying A159577, I think it is an 
erroneous duplicate of A116536.  I have had a response from the author 
of A159577 and he cannot recall exactly what he was doing.

I quote a small piece from his email to me:

I can’t run UBASIC myself anymore. I don’t recall noticing A116536 when 
I did mine, but it was first in time (I see also a note that it had been 

As to 2/2 being valid, You may be right. I operated on the theory that a 
product must have at least two terms and the same for a sum.

I think my title explains what I did, along with the example. Don’t know 
about the other – maybe both can be amplified. It appears that I did 
begin with 2 for each term.

This is the first time I have encountered this kind of discrepancy in 
OEIS, so I'm not sure what the proper procedure is for resolving this 
kind of potential error.


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