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

Author

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

Keywords

• nonn

Comments

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

Crossrefs

A007925, A174379

Programs

Mathematica

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