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 A064787 Inverse permutation to A053212. 3
 1, 2, 3, 4, 6, 5, 11, 7, 8, 9, 23, 10, 31, 15, 13, 12, 58, 14, 74, 16, 18, 29, 122, 17, 25, 40, 21, 22, 224, 19, 267, 20, 38, 69, 33, 24, 453, 89, 49, 26, 636, 28, 737, 43, 30, 141, 995, 27, 53, 35, 84, 57, 1523, 34, 59, 36, 108, 257, 2244, 32, 2528, 310, 41, 37, 77, 52 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(n) is the index of A005179(n) in A007416; equivalently, a(n) is the number of minimal numbers (numbers in A007416) that are <= A005179(n). - Jianing Song, Aug 16 2022 LINKS Table of n, a(n) for n=1..66. Index entries for sequences that are permutations of the natural numbers EXAMPLE a(23) = 122 because d(n) (A000005(n)) takes 121 different values before it first reaches 23 (at n = 2^22). PROG (Haskell) import Data.List (elemIndex); import Data.Maybe (fromJust) a064787 = (+ 1) . fromJust . (`elemIndex` a053212_list) -- Reinhard Zumkeller, Apr 18 2015 CROSSREFS Cf. A053212, A005179, A007416, A000005. Sequence in context: A263266 A263268 A257472 * A369137 A075160 A119755 Adjacent sequences: A064784 A064785 A064786 * A064788 A064789 A064790 KEYWORD easy,nonn AUTHOR N. J. A. Sloane, Oct 20 2001 EXTENSIONS More terms from Naohiro Nomoto, Oct 31 2001 More terms from David Wasserman, Aug 14 2002 STATUS approved

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Last modified April 13 03:15 EDT 2024. Contains 371639 sequences. (Running on oeis4.)