A096912 Numbers n such that 111*10^n+1 is prime.

8, 16, 20, 62, 64, 76, 100, 142, 230, 670, 2230, 167644

Offset: 1

Author

Jason Earls, Aug 17 2004

Keywords

• more
• nonn

Comments

a(1) through a(11) have been proved to be prime with WinPFGW.

Programs

PARI

is(n)=ispseudoprime(111*10^n+1) \\ Charles R Greathouse IV, Jun 12 2017

Extensions

a(12) from Predrag Kurtovic, May 24 2015