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A224948 Leap years having 53 Wednesdays and Thursdays. 0
1592, 1620, 1648, 1676, 1716, 1744, 1772, 1812, 1840, 1868, 1896, 1908, 1936, 1964, 1992, 2020, 2048, 2076, 2116, 2144, 2172, 2212, 2240, 2268, 2296, 2308, 2336, 2364, 2392, 2420, 2448, 2476, 2516, 2544, 2572, 2612, 2640, 2668, 2696, 2708, 2736, 2764, 2792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Gregorian calendar repeats after every 400 years because number of days in 400 years is 146097 which is a multiple of 7.

Non-century years are leap years if and only if they are multiples of 4 while century years are leap years if and only if they are multiples of 400.

14 occurrences in 400 years.

Months having Friday the 13th: March and November.

February 29th falls on Saturday.

366 day leap year: 52 Sundays, 52 Mondays, 52 Tuesdays, 53 Wednesdays, 53 Thursdays, 52 Fridays, 52 Saturdays.

LINKS

Table of n, a(n) for n=1..43.

Time and Date, The Gregorian calendar

Time and Date, 1992

Wikipedia, Gregorian calendar

MATHEMATICA

Select[Range[1583, 2800], DayOfWeek[{#, 1, 1}, Calendar -> Gregorian] == Wednesday && DaysBetween[{#, 1, 1}, {# + 1, 1, 1}, Calendar -> Gregorian] == 366 &, 50] (* T. D. Noe, Apr 22 2013 *)

CROSSREFS

Sequence in context: A224939 A049520 A252085 * A238075 A250959 A224943

Adjacent sequences:  A224945 A224946 A224947 * A224949 A224950 A224951

KEYWORD

nonn

AUTHOR

Aswini Vaidyanathan, Apr 21 2013

STATUS

approved

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Last modified June 19 05:18 EDT 2021. Contains 345125 sequences. (Running on oeis4.)