[seqfan] Re: A175388(?)

Douglas McNeil mcneil at hku.hk
Sun Apr 25 14:25:32 CEST 2010


 %C A175388 Actually, a(17) = 46*10^198 - 1, 45 concatenated (or
concatenating?) with 197 nines.

Z. Seidov writes:

> (* Frankly, I'm not 100% sure that a(17) is OK. *)

I'm not sure about this either.  I think 46*10^198-1 actually only takes 5
steps (16079, 167, 86, 100, 1) and I couldn't find a potential
typo-corrected version which works either (it has 198 nines, not 197,
right?)

If I've done everything correctly, I find instead a(17) = 578 * 10**(196)-1
= 577999...9.


Doug

-- 
Department of Earth Sciences
University of Hong Kong



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