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Common difference in sets of 4 consecutive palindromic primes (palprimes) in arithmetic progression.
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%I #6 Sep 30 2013 17:01:51

%S 3000,30000,81000,30000,81000,810000,810000,1110000,1110000,810000,

%T 300000,300000,810000,1920000,810000,300000,300000,300000,300000,

%U 300000,1110000,8100000,8100000,11100000,8100000,8100000,3000000,11100000,8100000,8100000,8100000

%N Common difference in sets of 4 consecutive palindromic primes (palprimes) in arithmetic progression.

%e a(2)=30000 since (159202951, 159232951, 159262951, 159292951) is the second arithmetic progression of 4 consecutive palindromic primes with common difference = 30000.

%Y Cf. A059121.

%K nonn,base

%O 1,1

%A _Shyam Sunder Gupta_, Sep 29 2013