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Search: id:A085963
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| A085963 |
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Denominators of Farey fractions with prime numerators and denominators. |
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+0
1
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| 3, 5, 5, 3, 7, 5, 7, 5, 3, 7, 11, 11, 7, 5, 7, 11, 5, 11, 3, 7, 13, 11, 13, 11, 7, 13, 5, 7, 11, 13, 5, 11, 3, 7, 13, 17, 13, 17, 11, 13, 11, 7, 17, 13, 5, 17, 7, 11, 13, 5, 11, 17, 3, 7, 17, 13, 19, 17, 13, 19, 17, 11, 13, 19, 11, 7, 17, 19, 13, 5, 17, 7, 11, 13, 19, 5, 11, 17, 3, 19, 7
(list; graph; listen)
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OFFSET
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3,1
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PROGRAM
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(PARI) \ Farey sequence of order n fareyct(n) = { forprime(x=2, n, y = farey(x); \ print1(y", "); ) } farey(n) = { c=0; m=n*(n-2)+2; a=vector(m); forprime(x=1, n, forprime(y=x, n, v = x/y; if(v<1, c++; a[c]=v; ) ) ); a = vecsort(a); c=0; for(x=2, m, if(a[x]<>a[x-1] & a[x]<>0, print1(numerator(a[x])", "); c++; ) ); return(c) }
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CROSSREFS
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Cf. A085692.
Sequence in context: A141334 A129488 A053670 this_sequence A119280 A016658 A131506
Adjacent sequences: A085960 A085961 A085962 this_sequence A085964 A085965 A085966
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Aug 17 2003
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