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%I #9 Sep 08 2022 08:45:18
%S 23,33,47,51,81,87,93,99,101,113,117,129,147,149,161,171,173,189,197,
%T 201,231,233,239,267,269,279,281,299,309,323,327,353,359,377,381,401,
%U 407,411,419,437,441,453,479,503,507,527,549,551,569,591,593,597,609
%N Numbers n such that the string 53n is the decimal expansion of a prime number.
%e n=113 is in the sequence because 53113 is prime.
%o (Magma) [ n: n in [1..700] | IsPrime(Seqint(Intseq(n) cat [3, 5])) ];
%K nonn,base
%O 1,1
%A _Parthasarathy Nambi_, Jun 07 2005
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