|
| |
|
|
A103047
|
|
Numbers n such that 6*10^n + 8*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
|
|
1
|
| |
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Also numbers n such that (62*10^n+1)/9 is prime.
|
|
|
LINKS
|
|
|
|
FORMULA
|
|
|
|
MATHEMATICA
|
Do[ If[ PrimeQ[(62*10^n + 1)/9], Print[n]], {n, 0, 10000}]
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
more,nonn
|
|
|
AUTHOR
|
|
|
|
EXTENSIONS
|
|
|
|
STATUS
|
approved
|
| |
|
|
