A327846 - OEIS

%I #20 Mar 08 2020 23:25:54

%S 30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,

%T 6,5,4,3,2,1,0,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,

%U 9,8,7,6,5,4,3,2,1,0,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6

%N Full days remaining in the month on the Gregorian calendar starting at n-th day of a non-leap year.

%H Jinyuan Wang, <a href="/A327846/b327846.txt">Table of n, a(n) for n = 1..365</a>

%e On March 27th, the 86th day of the year where n=86, there are 4 full days left in the month of March, a(86)=4.

%t Array[Range[# - 1, 0, -1] &@ Which[MemberQ[{4, 6, 9, 11}, #], 30, # == 2, 28, True, 31] &, 12] // Flatten (* _Michael De Vlieger_, Sep 30 2019 *)

%o (C++)

%o #include <iostream>

%o using namespace std;

%o int main(){

%o     int m=1;

%o     for(int d=30;m<=12;d--){

%o         cout<<d<<",";

%o         if(d==0){

%o             m++;

%o             if(m==4||m==6||m==9||m==11)

%o                 d=30;

%o             else if(m==2)

%o                 d=28;

%o             else

%o                 d=31;

%o         }

%o     }

%o }

%Y Cf. A061251, A073304.

%K nonn,fini,full

%O 1,1

%A _Andrew Pham_, Sep 27 2019