OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
k=109 is in the sequence because 4444k = 4444109 is prime.
MATHEMATICA
Select[Range[800], PrimeQ[4444*10^IntegerLength[#]+#]&] (* Harvey P. Dale, Jul 04 2014 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Sep 14 2005
STATUS
approved