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!)
A236761 Numbers n such that n^4-n+1 is prime. 3

%I

%S 3,6,9,13,16,18,19,24,33,39,43,45,46,60,63,64,69,75,78,79,85,91,94,

%T 105,106,108,109,115,121,129,138,174,175,183,195,198,205,210,220,249,

%U 250,276,289,295,300,309,313,318,324,343,346,348

%N Numbers n such that n^4-n+1 is prime.

%e 115^4 - 115 + 1 = 174900511 is prime. Thus, 115 is a member of this sequence.

%t Select[Range[400],PrimeQ[#^4-#+1]&] (* _Harvey P. Dale_, Jun 03 2015 *)

%o (Python)

%o import sympy

%o from sympy import isprime

%o {print(n) for n in range(10**3) if isprime(n**4-n+1)}

%o (PARI)

%o s=[]; for(n=1, 400, if(isprime(n^4-n+1), s=concat(s, n))); s \\ _Colin Barker_, Jan 31 2014

%Y Cf. A049408, A126424.

%K nonn

%O 1,1

%A _Derek Orr_, Jan 30 2014

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 February 28 22:44 EST 2020. Contains 332336 sequences. (Running on oeis4.)