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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A155028 Primes p such that p^3 + 2*p^2 + p + 1 is also prime. 1

%I

%S 2,5,7,13,23,47,79,89,103,109,137,139,193,223,229,257,277,293,317,347,

%T 379,389,443,457,499,593,607,653,677,709,733,823,853,883,907,953,1013,

%U 1033,1087,1103,1117,1283,1297,1307,1327,1367,1409,1489,1523,1549,1597

%N Primes p such that p^3 + 2*p^2 + p + 1 is also prime.

%H Vincenzo Librandi, <a href="/A155028/b155028.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime[Range[1600]], PrimeQ[(#^3 + 2*#^2 + # + 1)]&] (* _Vincenzo Librandi_, Oct 30 2012 *)

%o (MAGMA) [p: p in PrimesUpTo(1600)| IsPrime(p^3 + 2*p^2 + p + 1)]; // _Vincenzo Librandi_, Oct 30 2012

%Y Cf. A154686.

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Jan 19 2009

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 April 25 18:12 EDT 2019. Contains 322461 sequences. (Running on oeis4.)