login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A226915 Fourth column of A226518. 2

%I #3 Jun 22 2013 10:57:10

%S -1,1,1,1,1,-1,3,-1,1,1,1,-1,3,-1,1,1,-1,3,3,1,1,1,3,-1,1,1,1,1,1,1,1,

%T -1,-1,1,1,-1,3,-1,1,1,3,3,-1,1,-1,1,1,1,1,3,3,1,1,3,-1,1,1,1,-1,-1,

%U -1,3,3,-1,-1,3,1,1,1,3,1,1,-1,3,-1,1,1,3,1,1,3,3,1,1,1,3,-1,1,1,3,1,1,-1,3,-1,1

%N Fourth column of A226518.

%F a(n) = 1 + Legendre(2,p) + Legendre(3,p) where p = prime(n).

%Y Cf. A226518.

%K sign

%O 3,7

%A _N. J. A. Sloane_, Jun 22 2013

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | 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 September 19 02:20 EDT 2024. Contains 376003 sequences. (Running on oeis4.)