[seqfan] Re: superbirthdays

[Andrew Weimholt]

On Sun, Jan 16, 2011 at 4:54 PM, Robert Munafo <mrob27 at gmail.com> wrote:
> Yeah, I guess I'll relent on this one -- if only because those sequences
> work for the *Julian* (not Gregorian calendar) and there are some (Orthodox
> Christians and some people in Egypt I believe) who still use that calendar,
> and there is also the Coptic calendar which has the same pattern and has
> been in continuous use since Ptolemy! :-)
>
> - Robert

There are actually 5, sequences that work for the Julian calendar...

Those born on Feb 29, have super birthdays every 28 years.
This happens to already be in the OEIS:
A135628 = 0, 28, 56, 84, ...

Andrew