The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A165951 a(n) = (Sum of the quadratic non-residues of prime(n) - Sum of the quadratic residues of prime(n)) / prime(n) 5
 0, 0, 0, 1, 1, 0, 0, 1, 3, 0, 3, 0, 0, 1, 5, 0, 3, 0, 1, 7, 0, 5, 3, 0, 0, 0, 5, 3, 0, 0, 5, 5, 0, 3, 0, 7, 0, 1, 11, 0, 5, 0, 13, 0, 0, 9, 3, 7, 5, 0, 0, 15, 0, 7, 0, 13, 0, 11, 0, 0, 3, 0, 3, 19, 0, 0, 3, 0, 5, 0, 0, 19, 9, 0, 3, 17, 0, 0, 0, 0, 9, 0, 21, 0, 15, 5, 0, 0, 0, 7, 7, 25, 7, 9, 3, 21, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,9 COMMENTS Also, a(n) = (sum (floor (j^2/p(n))), j = 1:p(n)-1) - floor ((p(n)-2)(p(n)-1)/3) for n >= 3. LINKS C. H. Gribble, Table of n, a(n) for n=1,..., 348513 (i.e. for primes < 5x10^6). CROSSREFS a(3:) = A125616 - A076410. Sequence in context: A247706 A247704 A127802 * A300288 A094901 A030220 Adjacent sequences:  A165948 A165949 A165950 * A165952 A165953 A165954 KEYWORD nonn AUTHOR Christopher Hunt Gribble, Oct 01 2009 EXTENSIONS a(1:2) added and cross-reference section modified by Christopher Hunt Gribble, Oct 07 2009 Comment corrected by Christopher Hunt Gribble, Oct 17 2009 Comment corrected by Christopher Hunt Gribble, Oct 29 2009 STATUS approved

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

Last modified January 19 06:28 EST 2021. Contains 340266 sequences. (Running on oeis4.)