A228533 - OEIS

%I #11 Aug 24 2013 23:13:23

%S 11,11311,1074107,100111001,10001610001,1000017100001,100000321000003,

%T 10000001910000001,1000000118100000011,100000000381000000003,

%U 10000000001710000000001,1000000000016100000000001,100000000000131000000000001,10000000000003610000000000003

%N Smallest primes of 2n or more digits such that the number formed from first n digits is same as the number formed from last n digits.

%H Shyam Sunder Gupta, <a href="/A228533/b228533.txt">Table of n, a(n) for n = 1..100</a>

%e a(3) = 1074107 because the number formed from first 3 digits, that is, 107 is same as the number formed from last 3 digits and 1074107 is the smallest such prime.

%K nonn,base

%O 1,1

%A _Shyam Sunder Gupta_, Aug 24 2013