User talk:Rainer Rosenthal

I look for eMail contact to Giovanni Resta. I found erroneous values in A272773 from n=5 on. So for example A272773(5) should be 13696 instead of 13680. I don't talk without thinking, but after having finished my Maple program for this sequence I found the discrepancy and discussed it with Hugo Pfoertner. Hugo made a FORTRAN program and even verified the 13680 etc. But when he showed me his king tours I was able to tell him the missing ones. He encouraged me to seek contact to Giovanni Resta. I am unable to read Mma programs, and I would like to see the idea behind the program given by Giovanni Resta.

Cheers, Rainer

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Dear Rainer,

My name is Alexander R. Povolotsky - I am also OEIS contributor. With regards to OEIS A355567 under the authorship of Hugo Pfoertner and to which you have contributed...

I came up with the sequence (unrelated to electrical domain) which starts as follows: {3,35,3465,...} - if needed I can obtain couple more terms... I noticed that A355567 contains above terms... I wonder if the mathematical apparatus used for A355567 could be modified just to describe the terms 3,35,3465? If so, could you help me with this?

Thanks, Best regards, Alexander R. Povolotsky apovolot@gmail.com

PS I have also attempted today to contact Hugo Pfoertner - so far no response.

Update: I have received reply from Hugo Pfoertner

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Dear Alexander,

At first glance it looks like you don't need a row, column or (sub-)diagonal from the triangular matrix of resistances, but a different index pattern. A problem can also be that the terms of the A355567 are already the denominator of a reduced fraction. Regardless of that, it should still be possible to use the recurrence (basically the Laplace equation) as given by Rainer Rosenthal (in cc) in A355565, and then keep only the denominators v of the coefficients of (2/Pi) at the selected index positions. Rainer also wrote a Maple program implementing the recurrence that is linked in A355565. https://oeis.org/A355565/a355565_1.txt

Best wishes Hugo

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So Dear Riner,

I would really appreciate your input/help explaining what Hugo mentioned re using developed by you recurrence and re next steps needed to be performed in order to describe sequence {3,35,3465,...}.

Thanks in advance, Alexander R. Povolotsky