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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A131530 Numbers k such that k^2 - k - 1 and k^2 - k + 1 are twin primes. 3

%I

%S 3,4,6,7,9,16,21,22,25,39,42,51,55,60,67,90,102,132,139,142,154,156,

%T 165,177,189,204,207,210,216,219,232,237,247,289,291,310,315,352,379,

%U 396,406,454,456,457,496,501,519,531,552,561,625,645,669,687,721,729,744

%N Numbers k such that k^2 - k - 1 and k^2 - k + 1 are twin primes.

%H Seiichi Manyama, <a href="/A131530/b131530.txt">Table of n, a(n) for n = 1..5000</a>

%o (MAGMA) [n: n in [0..500] | IsPrime(n^2-n-1) and IsPrime(n^2-n+1)] // _Vincenzo Librandi_, Nov 23 2010

%Y Intersection of A002328 and A055494. - _Michel Marcus_, Jan 24 2018

%K nonn

%O 1,1

%A _Pierre CAMI_, Aug 26 2007

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 3 05:29 EDT 2020. Contains 334798 sequences. (Running on oeis4.)