OFFSET
1,2
COMMENTS
For each year y divisible exactly by 400 the consecutive 97 leap years, in the 400 year cycle of the Gregorian calendar, are y+a(n), n=1,2,...,97.
A 4000 rule (declaring the years 4000,8000,... non-leap years) is not used here.
For the leap year rule for the Gregorian calendar see, e.g., Wikipedia.
FORMULA
Eliminate in the list 4*k, k=0,..99, the numbers 100, 200 and 300.
EXAMPLE
1600 + a(n), n=1,...,97 are leap years,
2000 + a(n), n=1,...,97 are leap years, etc.
CROSSREFS
KEYWORD
nonn,easy,fini,full
AUTHOR
Wolfdieter Lang, May 02 2011
STATUS
approved