There are 52 prime days in a non leap year.
In leap year there would be 53 days.
A prime year will never fall on a leap year because leap years are divisible by 4.
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52+1=53
A non- leap year has 52 prime days
January has 0
February has 9 in a non- leap year, and 10 in a leap year.
March has 11
April has 0
May has 11
June has 0
July has 11
August has 0
September has 0
October has 0
November has 10
December has 0
11+11+11+10+10=53 in a leap year.
11+11+11+10+09=52 in a non- leap year.