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 A239585 Prime factor <= other prime factor of n-th brilliant number, cf. A078972. 3
 2, 2, 3, 2, 2, 3, 3, 5, 5, 7, 11, 11, 13, 11, 11, 13, 13, 11, 17, 13, 11, 17, 11, 19, 13, 17, 13, 11, 19, 11, 11, 13, 17, 11, 17, 23, 13, 19, 13, 11, 19, 13, 17, 11, 23, 11, 13, 17, 19, 23, 17, 11, 13, 19, 11, 13, 17, 11, 19, 29, 23, 11, 13, 19, 29, 17, 11 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) = A020639(A078972(n)) = A078972(n) / A239586(n); A055642(a(n)) = A055642(A239586(n)). LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..20000 Dario Alpern, Brilliant Numbers EXAMPLE . n | A239585(n) | A239586(n) | A078972(n) Lengths of factors . --------+------------+------------+----------- ------------------ . 1 | 2 | 2 | 4 1 . 5 | 2 | 7 | 14 . 10 | 7 | 7 | 49 . |.........................| .................. . 11 | 11 | 11 | 121 2 . 78 | 11 | 97 | 1067 . 100 | 37 | 37 | 1369 . 241 | 97 | 97 | 9409 . |.........................| .................. . 242 | 101 | 101 | 10201 3 . 1000 | 193 | 263 | 50759 . 2530 | 101 | 997 | 100697 . 10000 | 743 | 937 | 696191 . 10537 | 997 | 997 | 994009 . |.........................| .................. . 10538 | 1009 | 1009 | 1018081 4 . PROG (Haskell) a239585 = a020639 . a078972 CROSSREFS Subsequence of A084126. Sequence in context: A153095 A254574 A306991 * A321788 A182093 A254618 Adjacent sequences: A239582 A239583 A239584 * A239586 A239587 A239588 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Mar 22 2014 STATUS approved

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Last modified May 25 03:08 EDT 2024. Contains 372782 sequences. (Running on oeis4.)