OFFSET
1,1
EXAMPLE
a(2)=810000 since (16831813861, 16832623861, 16833433861, 16834243861, 16835053861) is the second arithmetic progression of 5 consecutive palindromic primes with common difference = 810000.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Shyam Sunder Gupta, Sep 29 2013
STATUS
approved