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

256, 19683, 27000, 777600000, 1680700000, 139314069504, 351298031616, 140710042265625, 5766503906250000000000, 1156831381426176000000000000, 58431830141132800000000000, 99938258857146531850367031

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A046346.

Sequence in context: A238064 A235964 A206319 * A090650 A206181 A251968

Adjacent sequences: A216394 A216395 A216396 * A216398 A216399 A216400

Keyword

nonn

Author

Antonio Roldán, Sep 06 2012

Status

approved