%I #11 Dec 10 2014 20:45:26
%S 2,29,47,83,263,461,20147,23117,24107,63113,80141,81131,300893,301793,
%T 303593,308093,310883,313583,324473,333563,336263,342653,344453,
%U 348053,350843,354443,355343,356243,362633,363533,364433,365333,377123,378023
%N Primes which when added to their reversals are squares.
%C Idea from Carlos Rivera's The Prime Puzzles and Problems Connection, Conjecture 23.
%H Harvey P. Dale, <a href="/A059799/b059799.txt">Table of n, a(n) for n = 1..683</a> (* all such primes up to the 20 millionth prime *)
%F Add prime to its reverse. If a square, add to sequence.
%e a(4)=263 because 263+362=625 and 625 is a square whose root is 25.
%t Select[Prime[Range[33000]],IntegerQ[Sqrt[FromDigits[Reverse[ IntegerDigits[#]]]+ #]]&] (* _Harvey P. Dale_, Aug 18 2012 *)
%Y Cf. A035519, A059798.
%Y Cf. A227371 (indices of primes).
%K easy,nonn,base
%O 1,1
%A _Enoch Haga_, Feb 23 2001