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A117453 Perfect powers in more than one way. 12
1, 16, 64, 81, 256, 512, 625, 729, 1024, 1296, 2401, 4096, 6561, 10000, 14641, 15625, 16384, 19683, 20736, 28561, 32768, 38416, 46656, 50625, 59049, 65536, 83521, 104976, 117649, 130321, 160000, 194481, 234256, 262144, 279841, 331776, 390625 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Corresponding values of ways for a(n) in A175066(n) for n >= 2. - Jaroslav Krizek, Jan 23 2010
Perfect powers expressible as m^k with k composite. - Charlie Neder, Mar 02 2019
LINKS
Eric Weisstein's World of Mathematics, Perfect Power
EXAMPLE
16 = 2^4 = 4^2.
MATHEMATICA
s = Split@ Sort@ Flatten@ Table[ n^i, {n, 2, Sqrt@456975}, {i, 2, Log[n, 456975]}]; Union@ Flatten@ Select[s, Length@ # > 1 &] (* Robert G. Wilson v, Apr 12 2006 *)
CROSSREFS
Sequence in context: A233330 A370787 A322449 * A340588 A352475 A305242
KEYWORD
nonn
AUTHOR
Eric W. Weisstein, Mar 16 2006
EXTENSIONS
More terms from Robert G. Wilson v, Apr 12 2006
STATUS
approved

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Last modified March 29 08:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)