OFFSET
2,4
EXAMPLE
A007781(14) = 10809131718965763 = 3 * 61^2 * 968299894201, therefore a(14) = 4.
MATHEMATICA
Table[ Apply[ Plus, Transpose[ FactorInteger[n^n - (n - 1)^(n - 1)]] [[ -1]]], {n, 2, 52}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Mar 11 2002
EXTENSIONS
Edited and extended by Robert G. Wilson v, Mar 15 2002
a(53)-a(86) from Amiram Eldar, Feb 06 2020
STATUS
approved