OFFSET
1,1
COMMENTS
Also, numbers k such that (35*10^k - 53)/9 is prime.
Terms from Kamada data.
a(12) > 10^5.
LINKS
EXAMPLE
For k=2, 8*R_2 + 3*10^k - 5 = 88 + 300 - 5 = 383 which is prime.
MATHEMATICA
Select[Range[100000], PrimeQ[(35*10^#-53)/9] &] (* adapted by Vincenzo Librandi, Jun 19 2015 *)
CROSSREFS
KEYWORD
more,hard,nonn
AUTHOR
Robert Price, Jun 18 2015
EXTENSIONS
Corrected Mathematica code from Vincenzo Librandi, Jun 19 2015
STATUS
approved