[seqfan] superbirthdays

N. J. A. Sloane njas at research.att.com
Sun Jan 16 02:06:26 CET 2011

Dear Seq Fans,
Could someone volunteer to work out these 4 sequences and submit them?
(someone who hasn't anwered one of these requests in the past 30 days)


>On Thu, Jan 13, 2011 at 9:30 AM, Eric Angelini <Eric.Angelini at kntv.be> wrote:
>> 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]

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