[seqfan] Re: puzzled by A082945, definition of rev n
Maximilian Hasler
maximilian.hasler at gmail.com
Fri Apr 17 19:25:08 CEST 2009
A082945 Numbers starting with n such that n/(rev n) is the center
digit, where (rev n) is the reverse of n.
111, 212, 221, 313, 331, 414, 422, 441, 515, 551, 616, 623, 632, 661,
717, 771, 818, 824, 842, 881, 919, 933, 991
I think here it (rev n) means the last digit when n is the first digit
and probably the reversal of the last k digits when n are the first k digits.
(A priori any positive k <= number of digits of a(m) seems allowed.)
Maximilian
On Fri, Apr 17, 2009 at 1:01 PM, Richard Mathar
<mathar at strw.leidenuniv.nl> wrote:
>
> I am wondering what the definition of
> http://www.research.att.com/~njas/sequences/A082945
> might actually be. What does (rev n) mean, given the example that
> for the a(12) entry, n=6 is associated with rev n=2. I am only familiar
> with digit reversion equivalent to reading numbers from right to left,
> so a single-digit number is the same as its reversion, as in A004086.
> The aim is to extend
> http://www.research.att.com/~njas/sequences/A082946
>
> Richard J. Mathar
>
>
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