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%I #6 Mar 30 2012 17:25:45
%S 31,36,42,78,90,97,102,109,139,141,150,177,189,193,198,205,207,210,
%T 213,223,232,234,265,267,286,304,318,325,328,330,331,343,354,358,382,
%U 384,399,402,403,406,414,415,435,442,447,451,454,477,483,493,501,504,508,513,517,520,525,532,552
%N Numbers n such that the string n23572357 is prime.
%e n=4 is not in the sequence because n23572357 = 423572357 = 13*17*1916617 is composite.
%K nonn,base
%O 1,1
%A _Parthasarathy Nambi_, Aug 20 2005