STATUS
editing
approved
The OEIS is supported by the many generous donors to the OEIS Foundation.
editing
approved
(PARI) is(n)=ispseudoprime(9^n-8^n) \\ Charles R Greathouse IV, Jun 13 2017
approved
editing
Numbers n such that 9^n - 8^n is prime or a strong pseudo-primepseudoprime.
editing
approved
In general, for any positive integers n, a and b, a>b, a necessary condition for a^n-b^n to be prime is that either a-b=1 and n be a prime or n=1 and a-b be prime (from Arturo Magidin and Hagman in Sci.Math, Sep 11, 2010). [_- _Vincenzo Librandi_, Sep 12 2010]
approved
editing
editing
approved
Numbers n such that 9^n - 8^n is prime or a strong pseudo-prime.
In general, for any positive integers n, a and b, a>b, a necessary condition for a^n-b^n to be prime is that either a-b=1 and n be a prime or n=1 and a-b be prime (from Arturo Magidin and Hagman in Sci.Math, Sep 11 , 2010). [Vincenzo Librandi, Sep 12 2010]
approved
editing
proposed
approved
editing
proposed
_Mike Oakes (Mikeoakes2(AT)aol.com), _, Feb 23 2001
approved
editing