Some of leap years are wrong

[pourqavam]

Hi
I know the library is old but some leap years like 1403, 1436 and 1469 are calculated wrong and 1404, 1437 and 1470 determined as the leap year instead. (some of the 5-year leaps)
I think it's because of the Birashk algorithm.
http://www.fourmilab.ch/documents/calendar

[mortezaadi]

Thanks @pourqavam