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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A269227 Numbers n such that 7^n + 6^(n + 1) is prime. 0

%I

%S 0,1,4,5,12,16,27,87,252,1052,1691,3237,3669,16140,17072,27932,70811

%N Numbers n such that 7^n + 6^(n + 1) is prime.

%C a(18) > 10^5.

%t Select[Range[0,100000], PrimeQ[7^# + 6^(# + 1)] &]

%o (MAGMA) [n: n in [0..500] | IsPrime(7^n+6^(n+1))]; // _Vincenzo Librandi_, Jul 12 2016

%o (PARI) is(n)=ispseudoprime(7^n+6^(n+1)) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A093765.

%K nonn,more

%O 1,3

%A _Robert Price_, Jul 11 2016

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 November 21 06:00 EST 2019. Contains 329350 sequences. (Running on oeis4.)