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

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

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..12.

Prog

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

Crossrefs

Sequence in context: A327092 A112679 A212021 * A254141 A188438 A282256

Adjacent sequences: A096909 A096910 A096911 * A096913 A096914 A096915

Keyword

more,nonn

Author

Jason Earls, Aug 17 2004

Extensions

a(12) from Predrag Kurtovic, May 24 2015

Status

approved