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A216397 Numbers n that are a nontrivial power (exponent greater than 1) of sopfr(n). 0

%I

%S 256,19683,27000,777600000,1680700000,139314069504,351298031616,

%T 140710042265625,5766503906250000000000,1156831381426176000000000000,

%U 58431830141132800000000000,99938258857146531850367031

%N Numbers n that are a nontrivial power (exponent greater than 1) of sopfr(n).

%C Sopfr(a(n)) = A046346(n+1).

%e 139314069504 is in sequence because 139314069504=2^18*3^12; sopfr(139314069504) = 2*18+3*12 = 72 and 72^6=139314069504.

%Y Cf. A046346.

%K nonn

%O 1,1

%A _Antonio Roldán_, Sep 06 2012

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Last modified September 20 10:10 EDT 2019. Contains 327229 sequences. (Running on oeis4.)