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%I #11 Aug 21 2015 02:04:26
%S 2,4,13,30,73,82,120,168,227,422,433,451,607,612,798,1527,6958
%N Numbers n such that 1+131*10^(n-1)+100^n is prime.
%C No other terms < 10000.
%e For n=2, 11311 is prime.
%e For n=3, 1013101 is not prime.
%e For n=4, 100131001 is prime.
%o (PARI) isok(n)=isprime(1+131*10^(n-1)+100^n) \\ _Anders Hellström_, Aug 20 2015
%Y Cf. A171411, A171376.
%K nonn,more
%O 1,1
%A _Chai Wah Wu_, Aug 20 2015
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