OFFSET
1,2
COMMENTS
a(14) > 10^5. - Robert Price, Oct 31 2017
EXAMPLE
If k = 1 then (10^1*361 - 163)/9 = 383 (prime), so 1 is a term.
If k = 9 then (10^9*361 - 163)/9 = 40111111093 (prime), so 9 is a term.
MATHEMATICA
ParallelMap[ If[ PrimeQ[ (10^# 361-163)/9], #, Nothing] &, Range[6000]]
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Mikk Heidemaa, May 23 2017
EXTENSIONS
a(13) from Robert Price, Oct 31 2017
STATUS
approved