A191624 - OEIS

A191624

Largest prime factor of n^n - n^(n-1) - n^(n-2) - ... - n^2 - n - 1.

7, 19, 293, 1493, 179, 1091, 10593529, 379721, 165664841, 66987982331, 240717199, 28048051, 133933781, 25506609089573701, 107140256350247, 793435901761, 268232479553269300213, 4075297, 3063504618316968426599, 1372263056872621, 7514001866134191512025247

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OFFSET

3,1

LINKS

Daniel Suteu and Harvey P. Dale, Table of n, a(n) for n = 3..72 (terms 3..52 from Harvey P. Dale)

FORMULA

a(n) = A006530(A191690(n)).

MAPLE

A006530 := proc(n) max ( numtheory[factorset](n) ) ; end proc:

A191690 := proc(n) n^n-add( n^j, j=0..n-1) ; end proc:

A191624 := proc(n) A006530(A191690(n)) ; end proc:

seq(A191624(n), n=3..15) ; # R. J. Mathar, Jun 23 2011