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A074954 Least perfect power b^e such that b^e-n is also a perfect power, or 0 if no such perfect power exists. 3
9, 27, 4, 8, 9, 0, 8, 9, 25, 2197, 27, 16, 49, 0, 16, 25, 25, 27, 27, 36, 25, 49, 27, 25, 125, 27, 36, 32, 225, 6889, 32, 36, 49, 0, 36, 100, 64, 1369, 64, 49, 49, 0, 484, 125, 49, 289, 128, 49, 81, 0, 100, 196, 729, 81, 64, 64, 121, 0, 900, 64, 125, 0, 64, 100, 81, 0, 1156 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(A074981) = 0.

LINKS

Table of n, a(n) for n=1..67.

Eric Weisstein's World of Mathematics, Perfect Power.

EXAMPLE

a(30) = 6889: 30 = 83^2 - 19^3.

CROSSREFS

Cf. A001597.

Sequence in context: A056399 A256927 A135864 * A103952 A103955 A109041

Adjacent sequences:  A074951 A074952 A074953 * A074955 A074956 A074957

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 10 2002

STATUS

approved

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Last modified April 16 05:26 EDT 2021. Contains 343030 sequences. (Running on oeis4.)