[seqfan] Re: Anagrams of triangular numbers
Richard Guy
rkg at cpsc.ucalgary.ca
Sun Oct 18 17:21:22 CEST 2009
Note that 1 is the first & minus tooth trianglar number.
0 is the zeroth & minus oneth. R.
On Sat, 17 Oct 2009, Hans Havermann wrote:
> zak seidov wrote:
>
>> %S A166596
>> 0,120,4095,36046,147153,219453,1021735,1053426,104653,10149765,
>> %T A166596
>> 10294453,10348975,100486576,10725396,104379576,20759346,12347965,
>> %U A166596 101495628,129548656,102968425,104697685,102925378
>> %N A166596 Smallest triangular number exactly n anagrams of which
>> are triangular numbers.
>
> First off, I know that A000217 starts with 0, but A068094 states that
> there are only 3 one-digit triangular numbers, which would exclude
> zero. Looking at a couple of "encyclopedic" entries on the web, the
> tendency is to make 1 the first triangular number, A000217
> notwithstanding. Second, instead of your 15th entry 104379576, I have
> 103428153 and instead of your 18th entry 101495628, I have 100174935.
> I'm unable to access my program for a day or so because I'm running
> something else. Can you check those two differences on your program?
>
>
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