OFFSET
1,1
EXAMPLE
a(4) = 3 as concatenation of 3^4 and 1 = 811 is a prime. 161 is not a prime.
MATHEMATICA
Do[k = 2; While[ !PrimeQ[10*k^n + 1], k++ ]; Print[k], {n, 1, 30}] (* Ryan Propper, Jul 08 2005 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Nov 03 2003
EXTENSIONS
Corrected and extended by Ryan Propper, Jul 08 2005
Further terms from David Wasserman, Sep 09 2005
STATUS
approved