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 A126888 a(n) is the smallest positive integer such that floor(a(n)/d(a(n))) = n, or -1 if no such number exists, where d(m) is the number of positive divisors of m. 5
 1, 5, 7, 28, 11, 13, 44, 17, 19, 63, 23, 51, 55, 29, 31, 49, 69, 37, 77, 41, 43, 91, 47, 147, 153, 53, 111, 115, 59, 61, 125, 129, 67, 207, 71, 73, 296, 155, 79, 121, 83, 680, 261, 89, 183, 185, 284, 97, 399, 101, 103, 209, 107, 109, 221, 113, 459, 235, 237, 363, 247, 249 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Hugo van der Sanden and D. W. Wilson, Table of n, a(n) for n = 1..10000 MATHEMATICA f[n_] := Block[{k = 1}, While[Floor[k/Length[Divisors[k]]] != n, k++ ]; k]; Table[f[n], {n, 62}] (* Ray Chandler, Jan 04 2007 *) CROSSREFS Cf. A000005, A126889, A078709, A125056, A125057. Sequence in context: A144392 A268701 A317166 * A358582 A185302 A179305 Adjacent sequences: A126885 A126886 A126887 * A126889 A126890 A126891 KEYWORD nonn AUTHOR Leroy Quet, Dec 30 2006 EXTENSIONS Extended by Ray Chandler, Jan 04 2007. Added escape clause to definition at the suggestion of Hugo van der Sanden. - N. J. A. Sloane, Jul 01 2022 STATUS approved

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Last modified April 18 06:24 EDT 2024. Contains 371769 sequences. (Running on oeis4.)