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!)
A136049 a(n)=number of primes p such that (p,p+2) is a pair of twin primes with n^2 + n < p < n^2+3*n+2. 1

%I #7 Oct 19 2017 03:15:08

%S 2,1,1,1,1,0,2,0,2,0,2,1,2,2,1,1,1,1,1,2,0,1,2,2,1,0,1,3,1,0,3,2,1,1,

%T 4,0,3,1,2,3,1,2,2,2,5,1,3,1,1,1,4,2,1,1,2,3,4,4,2,2,2,4,4,5,2,3,2,3,

%U 2,3,1,1,5,3,2,2,2,3,2,2,6,4,1,2,3,4,1,3,1,3,3,2,3,4,2,5,2,3,5,3,4,2,2,4,2

%N a(n)=number of primes p such that (p,p+2) is a pair of twin primes with n^2 + n < p < n^2+3*n+2.

%H Pierre CAMI, <a href="/A136049/b136049.txt">Table of n, a(n) for n = 1..5000</a>

%e For n=1 we can take p = 3 and p = 5, with twin primes (3 5) and (5 7) and 3 and 5 are > 2 and < 6 so a(1)=2

%K nonn

%O 1,1

%A _Pierre CAMI_, Dec 12 2007; corrected Jan 24 2008

%E Verified by _Don Reble_, Jun 22 2008, including the b-file.

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 April 30 06:10 EDT 2024. Contains 372127 sequences. (Running on oeis4.)