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A027565 Largest number not of form k_1 k_2 .. k_n (1/k_1 + .. + 1/k_n), k_i integers >= 1. 4
1, 462, 52061, 33952307 (list; graph; refs; listen; history; text; internal format)
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
See A025052 for numbers of form ab+bc+ca (which is the case n=3), A027563 for n=4, A027564 for n=5. See also A027566.
Sequence in context: A267283 A289349 A023912 * A035847 A140905 A208619
KEYWORD
nonn,nice,hard
AUTHOR
STATUS
approved

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Last modified June 17 10:05 EDT 2024. Contains 373445 sequences. (Running on oeis4.)