

A027565


Largest number not of form k_1 k_2 .. k_n (1/k_1 + .. + 1/k_n), k_i integers >= 1.


4




OFFSET

2,2


LINKS



EXAMPLE

For n=2, the largest number not of the form k_1+k_2 with k_1>=1, k_2>=1 is 1! So a(2) = 1. For n=3 the largest number not of the form ab+bc+ca (a,b,c >= 1) is believed to be 462 (see A025052).


CROSSREFS



KEYWORD

nonn,nice,hard


AUTHOR



STATUS

approved



