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 A224942 Non-leap years beginning and ending on Thursday. 6
 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 Index entries for sequences related to calendars Index entries for linear recurrences with constant coefficients, signature (1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1). 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 *) Select[Range[1583, 2600], !LeapYearQ[{#}]&&DayName[{#, 1, 1}]==DayName[ {#, 12, 31}] == Thursday&] (* Harvey P. Dale, May 06 2022 *) CROSSREFS Cf. A224938, A224939, A224940, A224941, A224943, A224944. 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 25 07:15 EDT 2024. Contains 372782 sequences. (Running on oeis4.)