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%I #2 Mar 30 2012 18:52:39
%S 1,7,12,14,16,20,21,22,24,25,27,28,29,33,35,39,40,41,44,45,47,49,52,
%T 53,54,55
%N Either A162488(n)-+A162489(n) is prime.
%C Where A162488 are numbers x such that x^y+y^x is prime (for some y>1, y<x) and A162489 is least y such that x^y+y^x is prime (for x=A162488(n)).
%e a(1)=1 because A162488(1)-A162489(1)=1=nonprime and A162488(1)+A162489(1)=5=prime; a(2)=7 because A162488(7)-A162489(7)=31=prime and A162488(7)+A162489(7)=35=nonprime.
%Y Cf. A094133, A162488, A162489.
%K nonn
%O 1,2
%A _Juri-Stepan Gerasimov_, Mar 02 2010
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