Hi

[Nick Hobson]

Hi Jonathan,

Thank you for your kind words, though I don't think my site is quite in  
the same league as those of Ed Pegg, Jr. and Erich Friedman!

Thanks also for your suggestion re puzzle #35.  I have added a link to  
A115157 from the solution page.  Over the next few weeks I mean to go  
through my site checking for relevant OIES sequences to either link to or  
submit.  (With due regard for Neil's vacation!)  Though in many cases I  
already have a link; e.g. to A000670 for puzzle #131.

For instance, re puzzle #152 the sequence for Euler's totient valence  
function for 2^n is  
a(n)=2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,32,32,32,...  
.  This is quite neat in that it has a long string of consecutive  
integers, before settling on the value 32!  (Assuming there are only five  
Fermat primes.)  I first noticed this pattern on the MathWorld page --  
http://mathworld.wolfram.com/TotientValenceFunction.html, and wondered  
whether it continued indefinitely.  It's not too difficult to show that it  
doesn't.  A058213 references this point, so I will Cf. it.

Nick


On Mon, 04 Dec 2006 21:46:45 -0000, Jonathan Post <jvospost3 at gmail.com>  
wrote:

> Dear Nick,
>
> I love your website! It is in the great company of Ed Pegg, Jr., and Eric
> Friedman's math puzzle sites.
>
> Perhaps you'd like to submit the finite, full, sequence from the  
> solution to
> your problem #35 on cuboids:
>
> 480, 504, 560, 576, 630, 672, 720, 792, 840, 960, 1320, 1350, 1440, 1512,
> 1530, 1680, 1950, 2450, 2520, 4290
>
> Hold on: that's already in the OEIS as A115157.
>
> Thus, I'd like to suggest your problem #35's question and solution pages  
> be
> added to A115157 as hotlink references.
>
> -- Jonathan Vos Post
>
> On 12/4/06, Nick Hobson <nickh at qbyte.org> wrote:
>>
>> Hi Seqfans,
>>
>> I joined the mailing list at the weekend and I'd just like to briefly
>> introduce myself.  My name is Nick Hobson, and I run the website Nick's
>> Mathematical Puzzles. (http://www.qbyte.org/puzzles/)
>>
>> I have dozens of links to OEIS from my puzzle site, but it's only  
>> recently
>> that I've taken the time to explore it in some depth.  It really is an
>> amazingly rich resource, that offers a window into number theory and
>> combinatorics, in particular.  I especially like the wealth of comments
>> and references, both online and offline.
>>
>> Nick
>>