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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A215443 Numbers k such that 5^k + k^5 - 1 is prime. 1

%I

%S 1,3,9,13,27,225,505,1605,7417,9193,9235

%N Numbers k such that 5^k + k^5 - 1 is prime.

%C a(12) > 2*10^5. - _Robert Price_, May 24 2014

%t Select[Range[0, 3000], PrimeQ[5^# + #^5 - 1] &]

%o (MAGMA) [n: n in [0..300] | IsPrime(5^n + n^5 - 1)]

%o (PARI) is(n)=ispseudoprime(5^n+n^5-1) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A215437.

%K nonn,more

%O 1,2

%A _Vincenzo Librandi_, Sep 03 2012

%E a(9)-a(11) from _Robert Price_, May 24 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 January 22 04:27 EST 2020. Contains 331133 sequences. (Running on oeis4.)