A105431 Primes of form R_n + 2 {= (10^n + 17)/9}, R_n being the n-th repunit, i.e., primes consisting of a string of 1's followed by a terminal 3.

3, 13, 113, 1113, 111113, 1111111113, 111111111113, 1111111111111111111111113, 1111111111111111111111111111111111111111111111111111111111111111111111111111111111113

Offset: 1

Author

Lekraj Beedassy, Apr 08 2005

Keywords

• nonn

Comments

For the associated positive values n see A097683.

Links

• Makoto Kamada, Prime numbers of the form 11...113.
• Index entries for primes involving repunits

Crossrefs

Cf. A098406.