"Take any day. Next is the day 2 days before that. And next is the day 2 days before that and so on" Says Grandpa

"That is your sequence? What is that related to?" I ask

"You tell me. Use your imagination. Think out of box. Take a leap of faith. I will give you a hint. Pope." Said Grandpa.

Hmm. I started thinking. Monday-Saturday-Thursday-Tuesday-Sunday-Friday-Wednesday-Monday again and so on. Pope??

What is it that relates to those days in that order?


1 Answer 1


Is it:

The day of the week on which the 29th of February falls?


Our calendar is the Gregorian Calendar, named for Pope Gregory. Hence, also, leap of faith. Of course, this will fail every 100 years or so, since it's not a leap year when the year is divisible by 100. Of course, the exception to this occurs every 400 years, so 2000 was a leap year because it was the exception to the exception. But your grandfather was likely born after 1900 so maybe he wasn't too worried about that...

  • 2
    $\begingroup$ I kinda hope not, because what's being ignored here is actually that pope's contribution, and the sequence without that dates back to 45BC. $\endgroup$
    – Gareth McCaughan
    Commented Jan 4, 2019 at 11:52
  • $\begingroup$ @GarethMcCaughan - they way the answer is written, yes. But in the OP, grandpa merely gave 'pope' as a hint. It could be he meant that the pope broke it. $\endgroup$ Commented Jan 4, 2019 at 19:04

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