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Numbers n such that n=s^pi(pi(s)) where s is sum of its digits.
3

%I #2 Mar 30 2012 17:37:44

%S 1,3,4,81,234256,390625,614656,52521875,60466176,8303765625,

%T 24794911296,480682838924478847449

%N Numbers n such that n=s^pi(pi(s)) where s is sum of its digits.

%e 24794911296=(2+4+7+9+4+9+1+1+2+9+6)^pi(pi(2+4+7+9+4+9+1+1+2+9+6)) so 24794911296 is in the sequence.

%Y Cf. A135234, A135235, A135236.

%K base,fini,full,nonn

%O 1,2

%A _Farideh Firoozbakht_, Nov 24 2007