OFFSET
1,1
LINKS
Daniel Starodubtsev, Table of n, a(n) for n = 1..10000
EXAMPLE
If k=3, then 13331 is prime.
If k=39, then 13939391 is prime.
If k=65, then 16565651 is prime.
MATHEMATICA
Select[Range[360], PrimeQ[FromDigits[Flatten[IntegerDigits /@ {1, #, #, #, 1}]]] &]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Jan 29 2005
EXTENSIONS
Extended by Ray Chandler, Jan 30 2005
STATUS
approved