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

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