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A257770 Table read by rows: numbers k, 0<=k<=9, such that n is a Belgian-k number. 17

%I #5 May 08 2015 16:54:45

%S 0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0,8,0,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,

%T 5,6,7,8,9,0,2,3,5,6,8,9,0,1,4,5,8,9,3,4,8,9,2,3,8,9,1,2,8,9,0,1,8,9,

%U 0,8,9,8,9,0,2,4,6,8,0,1,3,4,6,7,9,0

%N Table read by rows: numbers k, 0<=k<=9, such that n is a Belgian-k number.

%C See A106039 for definition of Belgian-k numbers;

%C T(n,0) = A257778(n); T(n,A257773(n)) = A257779(n);

%C m is a Belgian-0 number iff T(m,0) = 0.

%H Reinhard Zumkeller, <a href="/A257770/b257770.txt">Rows n = 0..1000 of triangle, flattened</a>

%e The first 100 rows:

%e . 0 | 0 25 | 2,4,9 50 | 0,5 75 | 3,8

%e . 1 | 0,1 26 | 0,2,8 51 | 3,4,9 76 | 4

%e . 2 | 0,2 27 | 0,7,9 52 | 3,5 77 | 0,7

%e . 3 | 0,3 28 | 6,8 53 | 0,5,8 78 | 3

%e . 4 | 0,4 29 | 5,7 54 | 0,4,9 79 | 8

%e . 5 | 0,5 30 | 0,3,6,9 55 | 0,5 80 | 0,8

%e . 6 | 0,6 31 | 0,3,4,7,8 56 | 1,7 81 | 0,1,9

%e . 7 | 0,7 32 | 2,4,7,9 57 | 4,9 82 | 2,4

%e . 8 | 0,8 33 | 0,3,6,9 58 | 1,6 83 | 6,9

%e . 9 | 0,9 34 | 3,6 59 | 3 84 | 0,4

%e . 10 | 0,1,2,3,4,5,6,7,8,9 35 | 0,3,8 60 | 0,6 85 | 7

%e . 11 | 0,1,2,3,4,5,6,7,8,9 36 | 0,6,9 61 | 5,6 86 | 2,8

%e . 12 | 0,2,3,5,6,8,9 37 | 4,7 62 | 0,6,8 87 | 4

%e . 13 | 0,1,4,5,8,9 38 | 2,5 63 | 0,3,9 88 | 0,8

%e . 14 | 3,4,8,9 39 | 0,3 64 | 4,8 89 | 4

%e . 15 | 2,3,8,9 40 | 0,4,8 65 | 4 90 | 0,9

%e . 16 | 1,2,8,9 41 | 1,2,6,7 66 | 0,6 91 | 1,2

%e . 17 | 0,1,8,9 42 | 0,2,6,8 67 | 2,9 92 | 4,6

%e . 18 | 0,8,9 43 | 1,4,8 68 | 6 93 | 0,9

%e . 19 | 8,9 44 | 0,4,8 69 | 3,9 94 | 3,7

%e . 20 | 0,2,4,6,8 45 | 0,5,9 70 | 0,7 95 | 2

%e . 21 | 0,1,3,4,6,7,9 46 | 2,6 71 | 0,7,8 96 | 6

%e . 22 | 0,2,4,6,8 47 | 3 72 | 0,2,9 97 | 1,8

%e . 23 | 1,3,6,8 48 | 0,8 73 | 3,6 98 | 4

%e . 24 | 0,4,6 49 | 6 74 | 1,8 99 | 0,9 .

%o (Haskell)

%o a257770 n k = a257770_tabf !! n !! k

%o a257770_row n = filter belge [0..9] where

%o belge k = n == (head $ dropWhile (< n) $

%o scanl (+) k $ cycle $ (map (read . return) . show) n)

%o a257770_tabf = map a257770_row [0..]

%Y Cf. A257773 (row lengths), A257778 (min per row), A257778 (max per row),

%Y Belgian-k numbers, k=0..9: A106039, A106439, A106518, A106596, A106631, A106792, A107014, A107018, A107032, A107043.

%K nonn,tabf,base

%O 0,5

%A _Reinhard Zumkeller_, May 08 2015

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Last modified April 24 10:11 EDT 2024. Contains 371935 sequences. (Running on oeis4.)