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 A174431 #9 Jun 19 2021 13:13:53 %S A174431 0,0,0,1,0,0,0,6,0,0,0,4,0,0,0,2,0,0,0,7,0,0,0,5,0,0,0,3,0,0,0,1,0,0, %T A174431 0,6,0,0,0,4,0,0,0,2,0,0,0,0,0,0,0,4,0,0,0,2,0,0,0,7,0,0,0,5,0,0,0,3, %U A174431 0,0,0,1,0,0,0,6,0,0,0,4,0,0,0,2,0,0,0,7 %N A174431 Day of the week occurring 5 times in February, or 0 if no such day exists (1 to 7 are Sunday to Saturday). %H A174431 <a href="/index/Ca#calendar">Index entries for sequences related to calendars</a> %e A174431 a(1756) = 1 because February 1756 has 5 Sundays. %Y A174431 Cf. A119406 (Sundays), A135795 (Mondays), A141039 (Wednesdays). %Y A174431 Cf. A143994 (Tuesdays), A143995 (Thursdays). %K A174431 nonn %O A174431 1753,8 %A A174431 _J. Lowell_, Mar 19 2010 %E A174431 More terms from _R. J. Mathar_, Apr 15 2010 %E A174431 a(1827)-a(1840) from _Jinyuan Wang_, Jun 19 2021