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A103953 Smallest perfect power b^e such that b^e+n is also a perfect power, or 0 if no such perfect power exists. 4
8, 25, 1, 4, 4, 0, 1, 1, 16, 2187, 16, 4, 36, 0, 1, 9, 8, 9, 8, 16, 4, 27, 4, 1, 100, 1, 9, 4, 196, 6859, 1, 4, 16, 0, 1, 64, 27, 1331, 25, 9, 8, 0, 441, 81, 4, 243, 81, 1, 32, 0, 49, 144, 676, 27, 9, 8, 64, 0, 841, 4, 64, 0, 1, 36, 16, 0, 1089 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(A074981(n)) = 0.

LINKS

Table of n, a(n) for n=0..66.

FORMULA

a(n) = A074954(n)-n, if A074954(n)>0; a(n)=0, if A074954(n)=0.

CROSSREFS

Cf. A074954, A001597, A076444, A023056.

Sequence in context: A274303 A132586 A208400 * A076444 A023056 A103954

Adjacent sequences:  A103950 A103951 A103952 * A103954 A103955 A103956

KEYWORD

nonn

AUTHOR

Max Alekseyev, Feb 22 2005

STATUS

approved

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Last modified February 28 14:16 EST 2021. Contains 341707 sequences. (Running on oeis4.)