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!)
A173628 Primes p such that p^3 + 6, p^3 + 12 and p^3 + 18 are all prime. 2

%I #19 Sep 08 2022 08:45:50

%S 2351,6991,49451,193751,223781,769781,771431,779341,880211,903871,

%T 1064411,1066231,1383191,1447151,1745621,1898371,1974551,1999511,

%U 2015411,2025421,2435831,2476421,2695831,2805911,3531041,3679121

%N Primes p such that p^3 + 6, p^3 + 12 and p^3 + 18 are all prime.

%C All terms == 1 (mod 10). - _Robert Israel_, Mar 18 2020

%H Robert Israel, <a href="/A173628/b173628.txt">Table of n, a(n) for n = 1..1000</a>

%p filter:= t -> andmap(isprime, [t,t^3+6,t^3+12, t^3+18]):

%p select(filter, [seq(i,i=1..10^7,10); # _Robert Israel_, Mar 18 2020

%t Select[Prime[Range[300000]],AllTrue[#^3+{6,12,18},PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* _Harvey P. Dale_, May 28 2019 *)

%o (Magma) [p: p in PrimesUpTo(1000000)|IsPrime(p^3+6) and IsPrime(p^3+12) and IsPrime(p^3+18)] // _Vincenzo Librandi_, Dec 13 2010

%Y Cf. A173627 (p, p^2+6, p^2+12 and p^2+18 are all prime).

%K nonn

%O 1,1

%A _Zak Seidov_, Nov 09 2010

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 25 01:06 EDT 2024. Contains 371964 sequences. (Running on oeis4.)