[seqfan] Re: Idea for a sequence

Hans Havermann gladhobo at teksavvy.com
Wed Nov 25 16:43:47 CET 2015


I don't believe that there are further terms. If the only numbers that are square when prepended by 1 or 6 are 80625 and 890625 followed by an even number of zeros, none of these numbers are square when prepended by 80625.


> On Nov 24, 2015, at 11:55 PM, David Wilson <davidwwilson at comcast.net> wrote:
> 
> a(n) > 1 = smallest value such that a(i) concat a(n) is square for all i <
> n.
> 
> Starts
> 
> 1,6,80625
> 
> Are there any further elements?



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