This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A224948 #17 Jul 21 2024 20:12:21
%S A224948 1592,1620,1648,1676,1716,1744,1772,1812,1840,1868,1896,1908,1936,
%T A224948 1964,1992,2020,2048,2076,2116,2144,2172,2212,2240,2268,2296,2308,
%U A224948 2336,2364,2392,2420,2448,2476,2516,2544,2572,2612,2640,2668,2696,2708,2736,2764,2792
%N A224948 Leap years having 53 Wednesdays and Thursdays.
%C A224948 Gregorian calendar repeats after every 400 years because number of days in 400 years is 146097 which is a multiple of 7.
%C A224948 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.
%C A224948 14 occurrences in 400 years.
%C A224948 Months having Friday the 13th: March and November.
%C A224948 February 29th falls on Saturday.
%C A224948 366 day leap year: 52 Sundays, 52 Mondays, 52 Tuesdays, 53 Wednesdays, 53 Thursdays, 52 Fridays, 52 Saturdays.
%H A224948 Time and Date, <a href="http://www.timeanddate.com/calendar/gregorian-calendar.html">The Gregorian calendar</a>
%H A224948 Time and Date, <a href="http://www.timeanddate.com/calendar/?year=1992">1992</a>
%H A224948 Wikipedia, <a href="http://en.wikipedia.org/wiki/Gregorian_calendar">Gregorian calendar</a>
%H A224948 <a href="/index/Ca#calendar">Index entries for sequences related to calendars</a>
%H A224948 <a href="/index/Rec#order_15">Index entries for linear recurrences with constant coefficients</a>, signature (1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1).
%t A224948 Needs["Calendar`"]; 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 *)
%t A224948 Select[Range[1583,3000],LeapYearQ[{#}]&&DayName[{#,1,1}]==Wednesday&] (* _Ray Chandler_, Jul 26 2023, v9 or later, after _Harvey P.Dale_ at A224945 *)
%Y A224948 Cf. A224945, A224946, A224947, A224949, A224950, A224951.
%K A224948 nonn
%O A224948 1,1
%A A224948 _Aswini Vaidyanathan_, Apr 21 2013