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%I #9 Oct 03 2022 13:22:00
%S 31,73,139,149,163,167,173,193,197,331,347,359,367,397,719,769,911,
%T 947,967,977,1033,1039,1069,1087,1091,1109,1171,1279,1427,1433,1447,
%U 1487,1499,1543,1567,1571,1601,1607,1627,1709,1759,1777,1801,1861,1871,1879
%N Primes p such that concatenation p, 0, R(p) is also a prime (of course a palindromic prime).
%C Concatenation p and R(p) is a composite number (a multiple of 11).
%H Harvey P. Dale, <a href="/A083988/b083988.txt">Table of n, a(n) for n = 1..1000</a>
%e 31 is a member as 31013 is also prime.
%e 139 is a member as 1390931 is also a prime.
%t Select[Prime[Range[300]],PrimeQ[FromDigits[Join[IntegerDigits[#],{0},Reverse[ IntegerDigits[ #]]]]]&] (* _Harvey P. Dale_, Oct 03 2022 *)
%K base,nonn
%O 1,1
%A _Amarnath Murthy_, May 22 2003
%E More terms from _David Wasserman_, Dec 07 2004