The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A085963 Denominators of Farey fractions with prime numerators and denominators. 0
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; refs; listen; history; text; internal format)
OFFSET
3,1
LINKS
PROG
(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) }
CROSSREFS
Cf. A085692.
Sequence in context: A211023 A279494 A053670 * A282177 A184593 A328154
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Aug 17 2003
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 28 18:29 EDT 2024. Contains 372919 sequences. (Running on oeis4.)