来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a210883 Showing 1-1 of 1 %I A210883 %S A210883 638,3652,4321,7335,8004,11016,14700,18382,22066,25748,29432,33115, %T A210883 37172,40186,40855,43869,44538,47550,51234,54916,58600,62282,65966, %U A210883 69649,73707,76721,77390,80404,81073,84085,87769,91451,95135,98817,102501,106184,110241 %N A210883 Number of days after Jan 01 1000 such that the date written in the ISO-8601-format YYYYMMDD is palindromic. %C A210883 There are exactly 331 palindromic dates between Jan 1 1000 and Dec 31 9999 (see b-file for the complete list). %C A210883 See A210884 for the corresponding dates. %C A210883 These are also the numbers of days after Jan 01 1000 such that the date written in the format MMDDYYYY is palindromic (see A210893). %C A210883 Because of the Gregorian Calendar Reform of 1582 these terms are fictitious, strictly speaking. 如果我们在1582之前采用日期改革,那么它们是有效的。获得“1月1日1000”之后的实际天数,从1582项减去5后的每一项表示1582之后的日期(这些是n高于43的项)。值5来自10月4日和10月15日之间10次跳过的“格里高利”日期,1582减去5、1000, 1100, 1300、1400和1500年中不属于格里高利闰年的5个朱利安闰日。“1 01 2000”后的第一个回文日期是20011002,这是序列A21088 4的第四十四项。“1月01日2000日”后的天数是640, 3654, 4323,7337, 8006, 11018,14702, 18384, 22068,25750, 29434, 33117,37174,…对于第四十四,第四十五,…第五十六…回文日期(见A210888).%H2A21088 3 Hieronymus Fischer,n,a(n)n=1…331的表%H A21088 3与日历相关的序列的索引条目%F A210883 n-th number of days after 'Jan 01 2000' = a(43+n) - 365242. %e A210883 The first palindromic date in YYYYMMDD format after 'Jan 01 1000' is A210884(1)=10011001 (= 'Oct 01 1001' = 'Jan 01 1000' + 638 days); %e A210883 The 47th palindromic date in YYYYMMDD format after 'Jan 01 1000' is A210884(47)=20200202 (= 'Feb 02 2020' = 'Jan 01 1000' + 372579 days = 'Jan 01 2000' + 7337 days). %e A210883 The last (331st) palindromic date in YYYYMMDD format before the year 10000 is A210884(331)=92900929 (= 'Sep 29 9290' = 'Jan 01 1000' + 3028132 days). %Y A210883 Cf. A210884 - A210895, A106605, A107273, A107275. %K A210883 nonn,base %O A210883 1,1 %A A210883 _Hieronymus Fischer_, Apr 01 2012 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE