A174380 Smallest prime factors of numbers of the form (n-1)^n - n^(n-1) A007925

17, 3, 47, 162287, 23, 257, 2486784401, 3, 33479, 83695120256591, 5, 67, 7, 3, 443881, 100417, 859, 79, 10745792197529, 3, 92798617729, 67, 1627, 11, 12298336501553, 3, 19, 241, 167, 3506869732968391733353, 5, 3, 47, 5, 317

Offset

4,1

Comments

For n = 1 to 3 no prime factors in A007925(n).

Links

Table of n, a(n) for n=4..38.

Mathematica

Table[FactorInteger[(n-1)^n-n^(n-1)][[1, 1]], {n, 4, 40}] (* Harvey P. Dale, May 25 2011 *)

Crossrefs

A007925, A174379

Sequence in context: A336485 A317317 A212602 * A040278 A254326 A040279

Adjacent sequences: A174377 A174378 A174379 * A174381 A174382 A174383

Keyword

nonn

Author

Torbjorn Alm (talm(AT)tele2.se), Mar 17 2010

Status

approved