In fact the -1 standard is not adhered. Sequences whose terms would normally be positive often use 0 if the particular term is undefined. To wit: https://oeis.org/search?q=or+0+if+no+such&language=english&go=Search returns 1368 results, whereas: https://oeis.org/search?q=or+-1+if+no+such&sort=&language=english&go=Search returns only 720 results. On Sun, Mar 11, 2012 at 19:10, Eugene Salamin <gene_salamin@yahoo.com>wrote:
From: Neil Sloane
The convention in the OEIS is to use -1 in cases when a term would be infinite or undefined. Neil
But can't -1 be a legitimate element of an integer sequence?
-- Gene
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