[seqfan] Re: A056240 Edit

Richard Mathar mathar at strw.leidenuniv.nl
Sun Nov 21 15:43:37 CET 2010


hh> From: Hans Havermann 
hh> To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
hh> Date: Thu, 18 Nov 2010 21:25:04 -0500
hh> Subject: [seqfan]  A056240 Edit
hh> ...
hh> be A={33,49,100,120,128,144,162} and was thus missing {70,84,135}. I  
hh> added the {2*5*7,2^2*3*7,3^3*5} to the  
hh> {3*11,7^2,2^2*5^2,2^3*3*5,2^7,2^4*3^2,2*3^4} (illustrating factors  
hh> that add to 14) and while the overall result looks OK, the underline  
hh> of what I added doesn't quite reflect what I actually added. Perhaps  
hh> this is some smallish bug.

The transition from 7^2 to 7^2,2*5*7,2^2*3*7 was flagged by the software
by scanning from the right to the left, not from the left to the right.
You expected that the leading 7^2 would not have been marked as being
replaced, but the scanner took the 7 in 2^2*3*7 and the ^2 in 2^2*3*7
as the "original" 7^2.
So there is no bug, just the standard problem that diff'ing with a software
that has no real artificial intelligence of the underlying syntax (comma
separated products in some comment section) build in does not lead to unique


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