3333

Number

$3003$ (three thousand, three hundred and thirty-three) is:

$3 \times 11 \times 101$

$3333 = 67^2 - 34^2$

According to 1986: David Wells: Curious and Interesting Numbers, the Gregorian calendar moves ahead $1$ day approximately every $3333$ years.

This is the result of using the slightly imprecise value of $365 \cdotp 2422$ days per tropical year.

Using the more precise value of $\approx 365 \cdotp 24219 \, 878$ days per tropical year, the number of years is approximately $3319$.

Note, however, that the Gregorian calendar moves backwards one day every $3319$ years, not ahead.

The origin of this statement is not given.