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%I #11 Jul 06 2016 00:55:39
%S 0,1,3,7,2,5,6,4,3,9,15,13,17,11,8,19,18,11,9,4,16,5,23,24,17,19,17,5,
%T 36,6,32,23,34,40,41,39,25
%N a(n) is the only number m such that 5^(2^m) + 1 is divisible by A273946(n).
%o (PARI) forstep(p=3, 10^15, 2, if(!Mod(p, 5)==0, if(isprime(p), o=znorder(Mod(5, p)); x=ispower(2*o); if(2^(x-1)==o, print1(x-2, ", ")))));
%Y Cf. A273946.
%K nonn,more
%O 1,3
%A _Arkadiusz Wesolowski_, Jun 25 2016
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