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A087319 Smallest number of the form n^k +1, with tau(a(n)) = tau(n), or 0 if no such number exists. 1
0, 2, 2, 0, 2, 217, 2, 65, 0, 10001, 2, 0, 2, 15, 226, 0, 2, 325, 2, 0, 22, 485, 2, 110075314177, 0, 27, 0, 0, 2, 27001, 2, 1025, 34, 35, 1226, 0, 2, 39, 1522, 64001, 2, 130691233, 2, 45, 0, 2117, 2, 0, 0, 0, 2602, 0, 2, 1338925209985, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

COMMENTS

If n is a square then a(n) = 0; the other zeros (n = 12, 20, 27, 28, 45, 48, 50, 52 and 55) are conjectures. I have checked them for k up to 255. - David Wasserman, May 09 2005

LINKS

Table of n, a(n) for n=2..56.

CROSSREFS

Cf. A087318.

Sequence in context: A347086 A137349 A087318 * A101348 A141659 A294519

Adjacent sequences:  A087316 A087317 A087318 * A087320 A087321 A087322

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Sep 03 2003

EXTENSIONS

More terms from David Wasserman, May 09 2005

STATUS

approved

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Last modified September 22 11:12 EDT 2021. Contains 347606 sequences. (Running on oeis4.)