[seqfan] Re: Super-birthday

[Charles Greathouse]

This would work in the Julian calendar, but it only works in the
Gregorian calendar if you avoid crossing one of ..., 1800, 1900, 2100,
2200, 2300, 2500, ...

Charles Greathouse
Analyst/Programmer
Case Western Reserve University

On Thu, Jan 13, 2011 at 9:30 AM, Eric Angelini <Eric.Angelini at kntv.be> wrote:
> Hello SeqFans,
> [sorry if this is known]
>
> I was born on Wednesday, September 12, 1951.
> My next "Wednesday, September 12" birthday
> (or super-birthday) was in 1956 together with
> my (ordinary) 5th birthday. Due to leap years,
> my personal sequence of super-birthdays is:
> S = 0,5,11,22,28,33,39,50,56,...
> Is it true that only 4 different such sequences
> exist (depending if you are born one year before
> a leap year, a leap year, one year after a leap
> year, two years after a leap year)?
> Is it true that, whatever their birth year is,
> all humans have a super-birthday which matches
> their regular 28th birthday?
>
> [This comes from a nice little book by
>  Alexandre Moatti: http://goo.gl/vB9r6]
>
> Best,
> É.
>
>
>
>
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