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Search: id:A101944
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| A101944 |
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Number of months in a 400-year cycle that have the thirteenth day of the month fall on the n-th day of the week, beginning with Sunday. |
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+0
2
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OFFSET
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1,1
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COMMENT
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Friday the thirteenth appears more often than any other day.
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REFERENCES
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Alfred S. Posamentier, Math Charmers, Tantalizing Tidbits for the Mind, Prometheus Books, NY, 2003, page 230.
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LINKS
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E. G. Richards, Mapping Time, The Calendar and its History, Oxford University Press, Great Clarendon Street, Oxford OX2 6DP, Reprinted 1999 (with corrections).
Index entries for sequences related to calendars
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MATHEMATICA
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(* first do *) Needs["Miscellaneous`Calendar`"] (* then *) t = Flatten[ Table[ DayOfWeek[{y, m, 13}], {y, 2000, 2399}, {m, 12}]]; d = Table[ DayOfWeek[{2006, 1, d}], {d, 1, 7}]; Table[ Count[t, d[[n]]], {n, 1, 7}]
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CROSSREFS
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Sequence in context: A022050 A107514 A116219 this_sequence A045150 A057116 A025355
Adjacent sequences: A101941 A101942 A101943 this_sequence A101945 A101946 A101947
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KEYWORD
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fini,full,nonn,dumb
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 28 2005
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