A189917 Pattern of the 97 consecutive leap years in a 400 year cycle of the Gregorian calendar.

0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 144, 148, 152, 156, 160, 164, 168, 172, 176, 180, 184, 188, 192, 196, 204, 208, 212, 216, 220, 224, 228, 232, 236, 240, 244, 248, 252, 256, 260, 264, 268, 272, 276, 280, 284, 288, 292, 296, 304, 308, 312, 316, 320, 324, 328, 332, 336, 340, 344, 348, 352, 356, 360, 364, 368, 372, 376, 380, 384, 388, 392, 396

Offset: 1

Author

Wolfdieter Lang, May 02 2011

Keywords

• nonn
• easy
• fini
• full

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.

Examples

			1600 + a(n), n=1,...,97 are leap years,
2000 + a(n), n=1,...,97 are leap years, etc.
		

Links

• Index entries for sequences related to calendars

Crossrefs

Cf. A131921.

Formula

Eliminate in the list 4*k, k=0,..99, the numbers 100, 200 and 300.