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A224941 Non-leap years beginning and ending on Wednesday. 0
1586, 1597, 1603, 1614, 1625, 1631, 1642, 1653, 1659, 1670, 1681, 1687, 1698, 1710, 1721, 1727, 1738, 1749, 1755, 1766, 1777, 1783, 1794, 1800, 1806, 1817, 1823, 1834, 1845, 1851, 1862, 1873, 1879, 1890, 1902, 1913, 1919, 1930, 1941, 1947, 1958, 1969, 1975, 1986, 1997 (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.

43 occurrences in 400 years.

Months having Friday the 13th: June.

365 day ordinary year: 52 Sundays, 52 Mondays, 52 Tuesdays, 53 Wednesdays, 52 Thursdays, 52 Fridays, 52 Saturdays.

LINKS

Table of n, a(n) for n=1..45.

Time and Date, The Gregorian calendar

Time and Date, 2014

Wikipedia, Gregorian calendar

MATHEMATICA

Select[Range[1583, 2600], DayOfWeek[{#, 1, 1}, Calendar -> Gregorian] == Wednesday && DaysBetween[{#, 1, 1}, {# + 1, 1, 1}, Calendar -> Gregorian] == 365 &, 50] (* T. D. Noe, Apr 22 2013 *)

CROSSREFS

Sequence in context: A235844 A277766 A224940 * A213116 A224942 A224950

Adjacent sequences:  A224938 A224939 A224940 * A224942 A224943 A224944

KEYWORD

nonn

AUTHOR

Aswini Vaidyanathan, Apr 21 2013

STATUS

approved

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Last modified May 7 23:48 EDT 2021. Contains 343652 sequences. (Running on oeis4.)