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 A127376 Perpetual calendar, giving the calendar for successive years of the 400-year cycle starting in year xy01, where xy is a 2-digit multiple of 4. Calendars 1 to 7 are for normal years starting on Monday, Tuesday, ..., Sunday; 8 to 14 are for leap years likewise. 1
 1, 2, 3, 11, 6, 7, 1, 9, 4, 5, 6, 14, 2, 3, 4, 12, 7, 1, 2, 10, 5, 6, 7, 8, 3, 4, 5, 13, 1, 2, 3, 11, 6, 7, 1, 9, 4, 5, 6, 14, 2, 3, 4, 12, 7, 1, 2, 10, 5, 6, 7, 8, 3, 4, 5, 13, 1, 2, 3, 11, 6, 7, 1, 9, 4, 5, 6, 14, 2, 3, 4, 12, 7, 1, 2, 10, 5, 6, 7, 8, 3, 4, 5, 13, 1, 2, 3, 11, 6, 7, 1, 9, 4, 5, 6, 14, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A090651 gives the 14-year repeating cycle applying between century years not a multiple of 400; this sequence extends that to the complete 400-year cycle. LINKS Ian Duff, Table of n, a(n) for n = 1..400 EXAMPLE 2001 is an ordinary year starting on a Monday, as a(1)=1; 2004 is a leap year starting on a Thursday, as a(4)=11; 2400 is a leap year starting on Saturday, as a(400)=13. PROG a(0)=13 for n=1 to 400 if (n mod 4 =0 and n mod 100 <>0) or n mod 400 =0 then a(n)=a(n-1)+8 : if a(n)>14 then a(n)=a(n)-7 else if (n-1 mod 4 =0 and n-1 mod 100 <>0) or n-1 mod 400 =0 then a(n)=a(n-1)-5 else a(n)=a(n-1)+1 end if if a(n)>7 then a(n)=a(n)-7 end if next n CROSSREFS Cf. A090651. Sequence in context: A084047 A282770 A145077 * A086146 A083758 A127494 Adjacent sequences:  A127373 A127374 A127375 * A127377 A127378 A127379 KEYWORD easy,nonn AUTHOR Ian Duff, Mar 30 2007 STATUS approved

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Last modified December 15 17:03 EST 2019. Contains 330000 sequences. (Running on oeis4.)