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%I #8 Dec 05 2013 19:55:12
%S 353,131713,171917,192319,293129,374137,434743,596159,677167,
%T 139149139,163167163,179181179,223227223,229233229,269271269,
%U 281283281,347349347,379383379,547557547,683691683,761769761,857859857,863877863
%N Primes obtained as a concatenation p,q,p where p and q are successive primes and p<q.
%e 171917 is a prime which is the concatenation of 17, 19 and 17.
%o (PARI) f(n)=prime(n)*(10^(ceil(log(prime(n+1))/log(10))+ceil(log(prime(n))/log(10))))+ prime(n+1)*10^ceil(log(prime(n))/log(10))+prime(n); for(n=1,300, if(isprime(f(n))==1,print1(f(n),",")))
%Y Cf. A068683, A078350.
%K base,nonn
%O 1,1
%A _Amarnath Murthy_, Mar 02 2002
%E More terms from _Benoit Cloitre_, Mar 21 2002
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