[seqfan] Incorrect Comment in A048133

Hans Havermann pxp at rogers.com
Wed Oct 6 02:08:39 CEST 2010


The comment is "a(18) <= 8634807937. a(19) <= 31914809583." But  
A048133 is identical to the different-offset A121360, except for the  
second term, and here we have "a(19) <= 61859965801. a(20) <=  
3154858254831. a(21) <= 6309716509658. a(22) <= 44168015567557." a(18)  
and a(19) of the former correspond to a(19) and a(20) of the latter  
because of the differing offsets.

I don't think that the A048133-comment numbers are *improved* upper  
bounds because of the equal-sign part of the bound. We can calculate  
the number of iterations for 8634807937 and 31914809583. They are (I  
think) 11 and 2 (if we conform to the sequence's zero-offset). We were  
expecting 18 and 19.




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