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A141287
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Years in which there are five Fridays in the month of February.
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21
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1760, 1788, 1828, 1856, 1884, 1924, 1952, 1980, 2008, 2036, 2064, 2092, 2104, 2132, 2160, 2188, 2228, 2256, 2284, 2324, 2352, 2380, 2408, 2436, 2464, 2492, 2504, 2532, 2560, 2588, 2628, 2656, 2684, 2724, 2752, 2780, 2808, 2836, 2864, 2892, 2904, 2932
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MAPLE
| A141287 := proc(n) nper := (n-1) mod 14 ; floor((n-1)/14)*400+op(1+nper , [1760, 1788, 1828, 1856, 1884, 1924, 1952, 1980, 2008, 2036, 2064, 2092, 2104, 2132]) ; end proc: seq(A141287(n), n=1..80) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 25 2010]
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MATHEMATICA
| (* First do *) Needs["Calendar`"] (* then *) fQ[y_] := Mod[y, 4] == 0 && Mod[y, 400]!=0 && DayOfWeek[{y, 2, 1}] == Friday; Select[Range[1750, 3051], fQ@# &] [From Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 11 2010]
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CROSSREFS
| Cf. A119406 (Sundays, ) A135795 (Mondays, ) A141039 (Wednesdays).
Cf. A143994, A143995 [From J. Lowell (jhbubby(AT)mindspring.com), Oct 06 2008]
Sequence in context: A186012 A031802 A020419 * A141039 A205731 A151769
Adjacent sequences: A141284 A141285 A141286 * A141288 A141289 A141290
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KEYWORD
| nonn
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AUTHOR
| J. Lowell (jhbubby(AT)mindspring.com), Aug 01 2008
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EXTENSIONS
| More terms by the 400-year periodicity of the Gregorian calendar by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 25 2010
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