A076951 - OEIS

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A076951

Smallest k > 0 such that nk-1 is an n-th power, or 0 if no such number exists.

1, 1, 3, 0, 205, 0, 39991, 0, 57, 5905, 9090909091, 0, 8230246567621, 0, 10371206370520815, 0, 17361641481138401521, 0, 37275544492386193492507, 0, 22706531343006, 0, 326583187044036098379401213863, 0, 45035996273705

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OFFSET

1,3

COMMENTS

p divides a(p) for odd primes p. a(p) = A081209(p-1) = p*A081215(p-1) for odd primes p. a(p)/p = A081215(p-1) = {1,41,5713,826446281,633095889817,1021273028302258913,...} - Alexander Adamchuk, Nov 12 2006

LINKS

Table of n, a(n) for n=1..25.

CROSSREFS

Cf. A076952.

Cf. A081209, A081215.

Sequence in context: A370712 A372314 A266380 * A359561 A060282 A060283

Adjacent sequences: A076948 A076949 A076950 * A076952 A076953 A076954

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Oct 20 2002

EXTENSIONS

More terms from Sascha Kurz, Jan 21 2003

STATUS

approved