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Smallest starting palindromic prime for n consecutive palindromic primes in arithmetic progression.
0

%I #7 Sep 30 2013 13:26:22

%S 3,1120211,13201010231,1981856124216581891

%N Smallest starting palindromic prime for n consecutive palindromic primes in arithmetic progression.

%C The next term is a(7) > 10^22.

%e First and smallest occurrence of n, n >= 3, consecutive palindromic primes in arithmetic progression:

%e a(3) = 3: (3, 5, 7);

%e a(4) = 1120211: (1120211, 1123211, 1126211, 1129211);

%e a(5) = 13201010231: (13201010231, 13202120231, 13203230231, 13204340231, 13205450231);

%e a(6) = 1981856124216581891: (1981856124216581891, 1981856135316581891, 1981856146416581891, 1981856157516581891, 1981856168616581891, 1981856179716581891)

%Y Cf. A059120, A059121, A059122.

%K nonn,base,hard,more

%O 3,1

%A _Shyam Sunder Gupta_, Sep 28 2013