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 A178054 #14 Feb 11 2023 15:56:42 %S A178054 6,2,3,6,1,4,6,2,5,0,3,5,1,4,4,0,2,5,0,3,6,1,4,6,2,5,5,1,3,6,1,4,0,2, %T A178054 5,0,3,6,6,2,4,0,2,5,1,3,6,1,4,0,1,4,6,2,4,0,3,5,1,3,6,2,2,5,0,3,5,1, %U A178054 4,6,2,4,0,3,3,6,1,4,6,2,5,0,3,5,1,4,4,0,2,5,0,3,6,1,4,6,2,5,6,2,4,0,2,5,1 %N A178054 Numbers representing the index of the day of week for the first day of the month in the Gregorian calendar. %C A178054 The index is 0-based, so 0 = Sunday, 1 = Monday, 2 = Tuesday, 3 = Wednesday, 4 = Thursday, 5 = Friday, 6 = Saturday. %C A178054 The first term in the sequence represents the day of the week index for January 1, A.D. 2000. %C A178054 The sequence repeats after 4800 terms, representing 400 years in the Gregorian calendar system. %D A178054 Arthur Benjamin and Michael Shermer, Secrets of Mental Math, First Edition, Three Rivers Press, 2006, p. 215. %H A178054 Lyle P. Blosser, <a href="/A178054/b178054.txt">Table of n, a(n) for n = 1..4800</a> %H A178054 <a href="/index/Ca#calendar">Index entries for sequences related to calendars</a> %F A178054 a(n+1) = (a(n) + A178055(n)) (mod 7). %e A178054 a(1) = 6, so day of week for January 1, 2000 is Saturday; a(2) = 2, so day of week for February 1, 2000 is Tuesday; a(3) = 3, so day of week for March 1, 2000 is Wednesday. %Y A178054 Cf. A178055. %K A178054 easy,nonn %O A178054 1,1 %A A178054 Lyle P. Blosser (lyleblosser(AT)att.net), May 18 2010