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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 Table of n, a(n) for n=2..5. 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 Adjacent sequences: A027562 A027563 A027564 * A027566 A027567 A027568 KEYWORD nonn,nice,hard AUTHOR R. H. Hardin STATUS approved

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