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A350471 The number of days elapsed since the Gregorian (proleptic) date Sunday, December 31, 1 BC on 1/1/n, where 1/1/n is the Gregorian date in the format month/day/year, the New Year's Day of the year n.

%I A350471 #23 Aug 21 2024 05:27:46
%S A350471 1,366,731,1096,1462,1827,2192,2557,2923,3288,3653,4018,4384,4749,
%T A350471 5114,5479,5845,6210,6575,6940,7306,7671,8036,8401,8767,9132,9497,
%U A350471 9862,10228,10593,10958,11323,11689,12054,12419,12784,13150,13515,13880,14245,14611,14976,15341,15706
%N A350471 The number of days elapsed since the Gregorian (proleptic) date Sunday, December 31, 1 BC on 1/1/n, where 1/1/n is the Gregorian date in the format month/day/year, the New Year's Day of the year n.
%C A350471 The number of days elapsed since the Gregorian date Sunday, December 31, 1 BC is also called the 'absolute date'. Note that there was no year 0. Thus this sequence shows the absolute date of the New Year's Day of the year n.
%H A350471 Peter Luschny, <a href="/A350471/a350471.txt">Table of n, a(n) for n = 1..3000</a>
%H A350471 Peter Luschny, <a href="https://github.com/PeterLuschny/Calendars.jl">Calendars, Conversions of Dates, Change of Calendars</a>, GitHub 2022.
%H A350471 John Walker, <a href="http://www.fourmilab.ch/documents/calendar/">Calendar Converter</a>.
%H A350471 Wikipedia, <a href="https://en.wikipedia.org/wiki/Gregorian calendar">Gregorian calendar</a>.
%H A350471 <a href="/index/Ca#calendar">Index entries for sequences related to calendars</a>
%F A350471 From _Robert B Fowler_, Aug 20 2024: (Start)
%F A350471 a(n) = 1 + 365*m + floor(m/4) - floor(m/100) + floor(m/400), where m = n-1.
%F A350471 a(n+400*k) = a(n) + 146097*k. (End)
%e A350471 Gregorian date 1/1/2022 = Julian date 12/19/2021 = Hebrew date 10/28/5782 = Islamic date 5/27/1443 = absolute date 738156.
%o A350471 (Python)
%o A350471 def A350471(n):
%o A350471     m = n - 1
%o A350471     return 1 + 365 * m + m // 4 - m // 100 + m // 400
%o A350471 print([A350471(n) for n in range(1, 45)])
%Y A350471 Cf. A350458 (Hebrew Calendar), A350539 (Islamic Calendar).
%K A350471 nonn
%O A350471 1,2
%A A350471 _Peter Luschny_, Jan 02 2022