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 A057350 #23 Mar 10 2022 03:53:45 %S A057350 30,29,30,29,30,29,30,30,30,29,30,30,29,30,29,30,29,30,29,30,29,29,29, %T A057350 30,29,30,29,30,29,30,29,30,29,30,29,30,29,30,29,30,29,30,29,30,30,30, %U A057350 29,30,30,29,30,29,30,29,30,29,30,30,30,29,30,29,30,29,30,29,30,29,30,29,29,29,30,30,29 %N A057350 Days in months in the Hebrew calendar starting from Nisan 5760 (Spring 2000 CE). %C A057350 The months are Nisan, Iyyar, Sivan, Tammuz, Av, Elul, Tishri, Heshvan, Kislev, Teveth, Shevat, Adar. A leap month of 30 days, added between Shevat and Adar, is called Adar I, where the final month is then called Adar II. Heshvan and Kislev (the 8th and 9th months) may each have 29 or 30 days, depending on the calendrical rules. %C A057350 36.22% of all years are "regular"; 25.51% are "deficient", with 29 days in both Heshvan and Kislev; 38.27% are "complete", with 30 days in both months. Note that Hebrew year 5760 is a 13-month leap year. - _Robert B Fowler_, Mar 08 2022 %C A057350 See A350458 for other comments, references, links, formulas, programs. %D A057350 N. Dershowitz and E. M. Reingold, Calendrical Calculations, Cambridge University Press, 1997. %H A057350 Wikipedia, <a href="https://en.wikipedia.org/wiki/Hebrew_calendar#Four_gates">Hebrew calendar Four gates</a>, Types of Hebrew calendar years and their frequencies. %e A057350 A regular year has the pattern 30, 29, 30, 29, 30, 29, 30, 29, 30, 29, 30, 29. %Y A057350 Cf. A057349 (Hebrew leap years). %Y A057350 Cf. A350458 (Chronological JDN of Tishri 1 in Hebrew calendar year (AM) n). %K A057350 nonn,easy %O A057350 0,1 %A A057350 _Mitch Harris_