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

1,1

Comments

For the associated positive values n see A097683.

Links

Table of n, a(n) for n=1..9.

Makoto Kamada, Prime numbers of the form 11...113.

Index entries for primes involving repunits

Crossrefs

Cf. A098406.

Sequence in context: A181083 A090537 A063269 * A360187 A053583 A077713

Adjacent sequences: A105428 A105429 A105430 * A105432 A105433 A105434

Keyword

nonn

Author

Lekraj Beedassy, Apr 08 2005

Status

approved