OFFSET
1,1
EXAMPLE
Since 3 is the second prime number and the concatenation of 2 and 3 gives 23, which is prime, 3 is in the sequence.
Since 59 is the seventeenth prime and the concatenation of 17 and 59 gives 1759, another prime, 59 is also in the sequence.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Juri-Stepan Gerasimov, Jan 19 2009
EXTENSIONS
Edited and extended beyond a(3) by Alonso del Arte, Jan 20 2009, with thanks to Klaus Brockhaus's edit of A154963
STATUS
approved