OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
Chris Caldwell, The First 10,000 Primes
EXAMPLE
4547 is a prime obtained by prefixing a 4 to the prime 547.
MATHEMATICA
Select[4*10^IntegerLength[#]+#&/@Prime[Range[300]], PrimeQ] (* Harvey P. Dale, Mar 25 2016 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Parthasarathy Nambi, Sep 19 2009
EXTENSIONS
More terms from Vincenzo Librandi, Sep 20 2009
STATUS
approved