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A047253
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Numbers that are congruent to {1, 2, 3, 4, 5} mod 6.
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5
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1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 63, 64, 65, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 79, 80, 81, 82, 83, 85, 86
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Numbers that are not divisible by 6. [From Benoit Cloitre (benoit7848c(AT)orange.fr), Jul 11 2009]
More generally the sequence a(n,m) of numbers not divisible by some fixed integer m>=2 is given by a(n,m)=n-1+floor((n+m-2)/(m-1)). [From Benoit Cloitre (benoit7848c(AT)orange.fr), Jul 11 2009]
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (1,0,0,0,1,-1).
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FORMULA
| a(n)=5+a(n-5). G.f.: x*(1+x)*(1+x+x^2)*(x^2-x+1) / ( (x^4+x^3+x^2+x+1)*(x-1)^2 ).
a(n)=n-1+floor((n+4)/5) [From Benoit Cloitre (benoit7848c(AT)orange.fr), Jul 11 2009]
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MATHEMATICA
| Select[Table[n, {n, 200}], Mod[#, 6]!=0&] (*From Vladimir Joseph Stephan Orlovsky, Feb 18 2011*)
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PROG
| (PARI) a(n)= 1+n+n\5
(PARI) a(n)=n-1+floor((n+4)/5) [From Benoit Cloitre (benoit7848c(AT)orange.fr), Jul 11 2009]
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CROSSREFS
| Cf. A097325.
Sequence in context: A194386 A187390 A039215 * A204878 A037918 A043091
Adjacent sequences: A047250 A047251 A047252 * A047254 A047255 A047256
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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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EXTENSIONS
| Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 18 2008
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