A057462 Numbers n such that 10*11^n + 1 is prime.

0, 10, 24, 864, 2440, 9438, 68272, 148602

Offset: 1

Author

Robert G. Wilson v, Sep 08 2000

Keywords

• nonn

Comments

a(9) > 2*10^5. - Robert Price, Jan 19 2015

Programs

Mathematica

Do[ If[ PrimeQ[ 10*11^n + 1 ], Print[ n ] ], {n, 0, 1000} ]
Select[Range[0, 4000], PrimeQ[(10*11^# + 1)] &] (* Vincenzo Librandi, Sep 28 2012 *)

PARI

is(n)=ispseudoprime(10*11^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

a(5) from Vincenzo Librandi, Sep 28 2012

a(6)-a(8) from Robert Price, Jan 19 2015