More digital silliness
zak seidov
zakseidov at yahoo.com
Thu Jan 10 10:25:28 CET 2008
typo correction:
totated=>rotated
--- zak seidov <zakseidov at yahoo.com> wrote:
Pairs of n<m
such that m is rotated n
and also m^2 is rotated n^2
{12,21},
{122,221},
{1222,2221},
{4615,5461},
{12222,22221},
{122222,222221},
{402046,640204},
{603069,960306},
{869041,904186},
{1222222,2222221}
Notice infinite pattern 12...2.
Corresponding squares:
{{144,441},{14884,48841},{1493284,4932841},{21298225,29822521},{149377284,493772841},{14938217284,49382172841},{161640986116,409861161616},{363692218761,922187613636},{755232259681,817552322596},{1493826617284,4938266172841}}.
zak
> --- Bob Hearn <seqfan at hearn.to> wrote:
>
> > This is a cute pair (but still only a pair):
> >
> > 1222222222^2 = 1493827159950617284,
> > 2222222221^2 = 4938271599506172841,
> >
> > rotating the result by one place.
> >
> > And here's a solution in base 23:
> >
> > 59L^2 = 16B964,
> > BL3^2 = 6416B9,
> > G4B^2 = B96416.
> >
> > Bob
> >
> >
> >
> > On Jan 9, 2008, at 2:33 PM, David W. Wilson wrote:
> >
> > > Let an n-digit number be valid if it does not
> > start or end with 0.
> > >
> > > Let a rotation of n be gotten by rotating its
> > digits. Thus the
> > > rotations of 256 are 256, 562 and 625.
> > >
> > > We note that 256 has two valid square rotations,
> > 256 and 625.
> > >
> > > Is there a number with more than two valid
> square
> > rotations?
> >
> >
>
>
>
>
>
____________________________________________________________________________________
> Be a better friend, newshound, and
> know-it-all with Yahoo! Mobile. Try it now.
>
http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
>
>
>
____________________________________________________________________________________
Be a better friend, newshound, and
know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
More information about the SeqFan
mailing list