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Search: id:A153990
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| A153990 |
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Period 6: repeat 1, 2, 5, 4, 7, 8. |
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+0
4
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| 1, 2, 5, 4, 7, 8, 1, 2, 5, 4, 7, 8, 1, 2, 5, 4, 7, 8, 1, 2, 5, 4, 7, 8, 1, 2, 5, 4, 7, 8, 1, 2, 5, 4, 7, 8, 1, 2, 5, 4, 7, 8
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Shares digits with other 6-periodic sequences, see the list in A153130.
Also the decimal expansion of the constant 13942/111111 [R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 23 2009]
Terms of the simple continued fraction of 485/(sqrt(4579599)-1807). [From Paolo P. Lava (ppl(AT)spl.at), Feb 17 2009]
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FORMULA
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a(n)-A141425(n) = A131533(n+2).
a(6n+0)+a(6n+5) = a(6n+1)+a(6n+4) = a(6n+2)+a(6n+3) = 9.
a(n)=(1/15)*{22*(n mod 6)+2*[(n+1) mod 6]-3*[(n+2) mod 6]+7*[(n+3) mod 6]-3*[(n+4) mod 6]+2*[(n+5) mod 6]}, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Jan 09 2009]
G.f.: (1+2x+5x^2+4x^3+7x^4+8x^5)/((1-x)(1+x)(1+x+x^2)(x^2-x+1)). [R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 23 2009]
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CROSSREFS
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Cf. A154811.
Sequence in context: A107921 A085801 A023843 this_sequence A154811 A036237 A015948
Adjacent sequences: A153987 A153988 A153989 this_sequence A153991 A153992 A153993
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KEYWORD
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nonn,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Jan 04 2009
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 23 2009
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