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!)
A094205 Lower bounds of twin prime pairs of the form prime(2n+1). 1

%I #5 Jul 07 2017 13:37:16

%S 5,11,17,41,59,137,149,179,191,197,227,269,347,419,431,461,599,617,

%T 1019,1031,1229,1289,1319,1427,1607,1697,1787,2027,2081,2087,2141,

%U 2309,2381,2549,2591,2711,2789,3299,3329,3359,3371,3389,3539,3581,3929,4001,4019

%N Lower bounds of twin prime pairs of the form prime(2n+1).

%H Harvey P. Dale, <a href="/A094205/b094205.txt">Table of n, a(n) for n = 0..1000</a>

%e For n=3, 2n+1 = 7 and prime(7) = 17 the lower bound of the (17,19) twin prime pair.

%t Select[Table[Prime[2n+1],{n,300}],PrimeQ[#+2]&] (* _Harvey P. Dale_, Jul 07 2017 *)

%o (PARI) f(n,start,step) = forstep(x=start,n,step,y=prime(x);if(isprime(y+2),print1(y",")))

%K easy,nonn

%O 0,1

%A _Cino Hilliard_, May 26 2004

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 20 02:14 EDT 2024. Contains 372703 sequences. (Running on oeis4.)