[seqfan] Re: A177045: ordering of expressions built from numbers 2 and exponentiations

franktaw at netscape.net franktaw at netscape.net
Tue May 4 02:29:59 CEST 2010

If you look at all expressions with up to k 2's, and sort them, the 
result will be correct up to and including the smallest number with 
exactly k 2's.

This does not address the question of how to compare two such 
expressions, since even with multiple-precision arithmetic, the values 
will overflow for a fairly low value of k.

Franklin T. Adams-Watters

-----Original Message-----
From: Vladimir Reshetnikov <v.reshetnikov at gmail.com>

Hello seqfans,

Can anybody suggest an effective way to calculate elements of A177045?
Currently I need to manually prove that each element is in the correct
position - and I do not see any general way to do it so that I can
generate elements of this sequence with an algorithm. I believe it is
closely related to A002845, although I do not think that there is a
formula connecting them. And please, check that I provided correct
initial elements of the sequence.

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