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