OFFSET
1,2
EXAMPLE
3^(3^3) = 7625597484987 and the sum of these digits is 81, the third term.
MATHEMATICA
Table[Apply[Plus, IntegerDigits[i^i^i]], {i, 1, 10}]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Hans Havermann, Nov 23 2003
STATUS
approved