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A224942 Non-leap years beginning and ending on Thursday. 0
1587, 1598, 1609, 1615, 1626, 1637, 1643, 1654, 1665, 1671, 1682, 1693, 1699, 1705, 1711, 1722, 1733, 1739, 1750, 1761, 1767, 1778, 1789, 1795, 1801, 1807, 1818, 1829, 1835, 1846, 1857, 1863, 1874, 1885, 1891, 1903, 1914, 1925, 1931, 1942, 1953, 1959, 1970, 1981, 1987, 1998 (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.

44 occurrences in 400 years.

Months having Friday the 13th: February, March and November.

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

LINKS

Table of n, a(n) for n=1..46.

Time and Date, The Gregorian calendar

Time and Date, 2009

Wikipedia, Gregorian calendar

MATHEMATICA

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

CROSSREFS

Sequence in context: A224940 A224941 A213116 * A224950 A233378 A083631

Adjacent sequences:  A224939 A224940 A224941 * A224943 A224944 A224945

KEYWORD

nonn

AUTHOR

Aswini Vaidyanathan, Apr 21 2013

STATUS

approved

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Last modified May 14 22:40 EDT 2021. Contains 343909 sequences. (Running on oeis4.)