# Challenge Response 176

## Is there Friday 13 every year?

There are 14 different calendars. There are seven possible calendars for non-leap years (one with January 1 for each day of the week).

The leap years have seven more calendars, resulting in a total of 14. For example, if January 1 is a Wednesday, we have:

January 1st - Wednesday
January 13th - Monday
February 1st - Saturday
February 13th - Thursday
March 1st - Saturday
March 13 - Thursday
April 1st - Tuesday
April 13 - Sunday
May 1st - Thursday
May 13th - Tuesday
June 1st - Sunday
June 13th - Friday
Since June 13 is a Friday, you can stop. The following table shows the total number of Fridays 13 for all calendars.

 When January 1st falls in Months of leap years with a friday 13 Months leap years with a friday 13 Monday April, July September December Tuesday September December June Wednesday June March, November Thursday February, March, November February, August Friday August May Saturday May October Sunday January, October January, April, July

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