login
This site is supported by donations to The OEIS Foundation.

 

Logo


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 * A094901 A030220 A219240

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 23 08:43 EDT 2017. Contains 286909 sequences.