OFFSET
1,1
EXAMPLE
a(2)=30000 since (159202951, 159232951, 159262951, 159292951) is the second arithmetic progression of 4 consecutive palindromic primes with common difference = 30000.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Shyam Sunder Gupta, Sep 29 2013
STATUS
approved