Search: id:A087367
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%I A087367
%S A087367 3,5,227,2237,3257,3527,3557,7757,22277,23537,25577,27527,27737,37337,
%T A087367 55337,57527,57557,72227,77237,223337,223757,225527,233327,272537,
%U A087367 277577,327557,327737,337277,357737,375257,377327,522227,525377,553277
%N A087367 Twin primes whose digits are primes.
%C A087367 Except for 3 and 5 these numbers must end in 7. If twin primes are infinite 
               can we prove these numbers are infinite?
%o A087367 (PARI) pdigitp(n) = { forprime(x=2,n, flag=1; y=x; if(isprime(x+2), for(j=1,
               length(Str(y)), r = y%10; if(!isprime(r),flag=0); y = floor(y/10); 
               ); if(flag,print1(x",")); ) ) }
%Y A087367 Sequence in context: A092947 A104996 A012817 this_sequence A058846 A101331 
               A087368
%Y A087367 Adjacent sequences: A087364 A087365 A087366 this_sequence A087368 A087369 
               A087370
%K A087367 easy,nonn
%O A087367 3,1
%A A087367 Cino Hilliard (hillcino368(AT)gmail.com), Oct 21 2003

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