OFFSET
1,1
COMMENTS
The primes must contain at least two digits.
EXAMPLE
The composite number 752 is obtained from the prime 257 by interchanging the first and last digits.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Aug 06 2010
EXTENSIONS
More terms from Vincenzo Librandi, Aug 06 2010
STATUS
approved