A071913 Smallest k such that A069624(k) = n.

1, 4, 9, 27, 81, 256, 1024, 4096, 16384, 78125, 390625, 1953125, 10077696, 60466176, 362797056, 2176782336, 13841287201, 96889010407, 678223072849, 4747561509943, 35184372088832, 281474976710656, 2251799813685248

Offset

1,2

Comments

All of entries shown are perfect powers.

Links

Table of n, a(n) for n=1..23.

Mathematica

a = Table[0, {15}]; Do[ b = Length[ Union[ Table[ Floor[n^(1/k)], {k, 2, 20}]]]; If[ a[[b]] == 0, a[[b]] = n], {n, 1, 10^6}]; a

Crossrefs

Cf. A069624.

Sequence in context: A365609 A198095 A256096 * A007872 A272016 A272089

Adjacent sequences: A071910 A071911 A071912 * A071914 A071915 A071916

Keyword

nonn

Author

Robert G. Wilson v, Jun 14 2002

Status

approved