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Search: id:A142702
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| A142702 |
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Period 4: repeat 5,2,5,8. |
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+0
1
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| 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8, 5, 2, 5, 8
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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From Balmer spectrum of hydrogen.
Terms of the simple continued fraction of 2/[sqrt(70)-8]. Decimal expansion of 478/909. [From Paolo P. Lava (ppl(AT)spl.at), Aug 05 2009]
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FORMULA
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a(n)=(1/12)*{19*(n mod 4)+[(n+1) mod 4]+[(n+2) mod 4]+19*[(n+3) mod 4]}, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Sep 29 2008]
a(n)=5+(3/2)*I*I^n-(3/2)*I*(-I)^n, with n>=0 and I=sqrt(-1) [From Paolo P. Lava (ppl(AT)spl.at), Sep 16 2009]
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PROGRAM
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(PARI) a(n)=5+3*cos(n*Pi/2) [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Aug 30 2009]
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CROSSREFS
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Sequence in context: A082571 A087300 A074455 this_sequence A085997 A071546 A154649
Adjacent sequences: A142699 A142700 A142701 this_sequence A142703 A142704 A142705
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Sep 23 2008
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 27 2008
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