- An interesting extension of Patrick De Geest's Table

is where 10^n+p and p are both prime (the first instance)

The table begins:

n---------p

=============

1---------3

2---------3

3---------13 ++

4---------7

5---------3 ++

6---------3

7---------19 ++

8---------7

9---------7

10--------19

11--------3 ++

12--------61

13--------37 ++

14--------283

15--------37

16--------61

17--------3 ++

18--------3

19--------97 ++

20--------151

Also, where n is prime, as marked ++ above.

Milton L. Brown - --- In primenumbers@yahoogroups.com, miltbrown@... wrote:
>

Patrick already has a list where 10^n-p1, 10^n+p2, n, p1 and p2 are all

> An interesting extension of Patrick De Geest's Table

> is where 10^n+p and p are both prime (the first instance)

>

prime on his page http://www.worldofnumbers.com/index.html . Just

search for "Exponent, -y and +y simultaneously prime" on the page.

Regards,

Dirk