OFFSET
1,2
COMMENTS
Largest number that can be expressed in the form a_1 ^ a_2 ^ ... ^ a_k, where a_1 + a_2 + ... + a_k = n. - Franklin T. Adams-Watters, Apr 09 2010
Equivalently, largest number that can be expressed using the constant 1 exactly n times with only addition and exponentiation -- no concatenation of digits is allowed. (Comment to facilitate searching.) - Rick L. Shepherd, Jun 14 2017
REFERENCES
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
S. W. Golomb and Judith Richman, Problem E2118, Amer. Math. Monthly, 76 (1969), 830-831.
FORMULA
For n >= 7, a(n) = 2^a(n-2). - Franklin T. Adams-Watters, Apr 09 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved