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Search: id:A080139
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| A080139 |
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Least positive integer multiples of angle x such that their direction cosines form a unit vector: sum(k>0, cos(a(k)*x)^2)=1, where a(1)=1, a(n+1)>a(n) and x=3-Pi/2. |
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+0
6
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| 1, 2, 10, 12, 23, 67, 100, 111, 122, 133, 355, 588, 832, 1065, 1298, 1542, 1775, 2485, 3195, 3905, 4615, 16208, 16918, 17628, 18338, 34901, 52174, 69447, 86720, 173795, 191068, 208341, 312689, 329962, 434310, 451583, 573204, 694825, 833719, 955340
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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x=(3-Pi/2)=1.429203673205103... some terms appear in A080138 (for x=3).
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PROGRAM
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(PARI) x=(3-Pi/2); z=cos(x)^2; a=1; for(n=1, 50, b=a+1; while(z+cos(b*x)^2>1, b++); z=z+cos(b*x)^2; a=b; print1(b, ", "))
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CROSSREFS
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Cf. A080136, A080137, A080138, A080140.
Sequence in context: A001363 A022367 A004686 this_sequence A055701 A154391 A035928
Adjacent sequences: A080136 A080137 A080138 this_sequence A080140 A080141 A080142
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Jan 30 2003
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EXTENSIONS
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More terms from Paul D. Hanna (pauldhanna(AT)juno.com), Feb 12 2003, using PARI program by Benoit Cloitre (benoit7848c(AT)orange.fr).
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