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A008685
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Lengths of months in the Gregorian calendar.
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7
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 28, 31
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| To make the definition unambiguous, consider these as starting from January 2001 (or, equivalently, AD 1 in the proleptic Gregorian calendar). [Charles R Greathouse IV, Sep 28 2011]
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LINKS
| Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
Index entries for sequences related to calendars
Index to sequences with linear recurrences with constant coefficients, order 4800.
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FORMULA
| a(n) = a(n-4800). [Charles R Greathouse IV, Sep 28 2011]
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PROG
| (PARI) v=[]; for(n=1, 50, v=concat(v, [31, if(n%4||(n%100==0&&n%400), 28, 29), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31])); v
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CROSSREFS
| Cf. A061251.
Sequence in context: A033351 A066434 A040932 * A162156 A141529 A022987
Adjacent sequences: A008682 A008683 A008684 * A008686 A008687 A008688
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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