OFFSET
1,1
COMMENTS
a(6) > 10^22.
EXAMPLE
a(2) = 191, since 191 and 313 are two consecutive palindromic primes with product of digits as 9 and this is the first occurrence of two consecutive palindromic primes whose product of digits is equal and nonzero.
CROSSREFS
KEYWORD
base,nonn,more
AUTHOR
Shyam Sunder Gupta, Oct 12 2013
STATUS
approved