The On-Line Encyclopedia of Integer Sequences (OEIS)

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A071913

Smallest k such that A069624(k) = n.
(history; published version)

#2 by Russ Cox at Fri Mar 30 17:30:44 EDT 2012

AUTHOR

_Robert G. Wilson v (rgwv(AT)rgwv.com), _, Jun 14 2002

Discussion

Fri Mar 30

17:30

OEIS Server: https://oeis.org/edit/global/156

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

Smallest k such that A069624(k) = n.

DATA

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.

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.

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 14 2002

STATUS

approved