cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-6 of 6 results.

A065650 Inverse permutation to A065649.

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 10, 15, 17, 19, 21, 23, 25, 27, 29, 31, 12, 30, 37, 39, 41, 43, 45, 47, 49, 51, 13, 32, 50, 59, 61, 63, 65, 67, 69, 71, 14, 34, 52, 70, 81, 83, 85, 87, 89, 91, 16, 35, 54, 72, 90, 103, 105, 107, 109, 111, 18, 36, 56, 74, 92, 110, 125, 127
Offset: 0

Views

Author

Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Nov 09 2001

Keywords

Crossrefs

Cf. A261279 (fixed points), A261294.

Programs

  • Haskell
    import Data.List (elemIndex); import Data.Maybe (fromJust)
    a065650 = fromJust . (`elemIndex` a065649_list)
    -- Reinhard Zumkeller, Aug 13 2015

Extensions

Offset changed by Reinhard Zumkeller, Aug 13 2015

A261279 Fixed points of A065649, a permutation of nonnegative integers based on Champernowne's constant.

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 32, 204, 354, 40964, 50322, 65964, 263125, 319166, 513764, 626082, 701753, 813764, 6179084, 6377296, 9679084, 72205374, 73333335, 74470716, 74522672, 87181372, 97270723, 112205374, 114522672, 517336266, 851684556, 1224783704
Offset: 1

Views

Author

Reinhard Zumkeller, Aug 14 2015

Keywords

Comments

Also fixed points of A065650, A261293 and A261294.

Crossrefs

Programs

  • Haskell
    a261279 n = a261279_list !! (n-1)
    a261279_list = [x | x <- [0..], a065649 x == x]

Extensions

a(23)-a(36) from Hiroaki Yamanouchi, Aug 21 2015

A261293 a(n) = A065649(A065649(n)).

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 15, 20, 25, 21, 30, 31, 35, 41, 40, 12, 45, 51, 50, 13, 115, 61, 60, 14, 81, 71, 32, 165, 92, 43, 103, 16, 54, 91, 114, 17, 65, 101, 125, 18, 76, 111, 126, 19, 121, 22, 26, 70, 131, 87, 36, 141, 46, 42, 151, 52, 56, 62
Offset: 0

Views

Author

Reinhard Zumkeller, Aug 14 2015

Keywords

Comments

Permutation of the nonnegatve integers with inverse A261294;
a(A065650(n)) = A065650(a(n)) = A065649(n).

Crossrefs

Cf. A065649, A065650, A261294 (inverse), A261279 (fixed points).

Programs

  • Haskell
    a261293 = a065649 . a065649

A261333 a(n) = 10*(A256100(n+1)-1) + A007376(n+1), a simple variation of A065649.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 0, 21, 31, 41, 12, 51, 13, 61, 14, 71, 15, 81, 16, 91, 17, 101, 18, 111, 19, 22, 10, 32, 121, 42, 52, 62, 23, 72, 24, 82, 25, 92, 26, 102, 27, 112, 28, 122, 29, 33, 20, 43, 131, 53, 132, 63, 73, 83, 34, 93, 35, 103, 36, 113, 37
Offset: 0

Views

Author

Reinhard Zumkeller, Aug 15 2015

Keywords

Comments

Permutation of the nonnegatve integers with inverse A261334.

Crossrefs

Cf. A256100, A007376, A261334 (inverse), A261335 (fixed points), A065649.

Programs

  • Haskell
    a261333 n = a261333_list !! n
    a261333_list = zipWith (+)
                   (map ((* 10) . subtract 1) a256100_list) a007376_list

A065648 a(0) = 1 and for n > 0: a(n) = number of indices 0 <= i <= n with A033307(i)=A033307(n), where A033307 is the sequence of decimal digits of Champernowne's constant 0.123456789101112131415...

Original entry on oeis.org

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 4, 5, 2, 6, 2, 7, 2, 8, 2, 9, 2, 10, 2, 11, 2, 12, 2, 3, 3, 4, 13, 5, 6, 7, 3, 8, 3, 9, 3, 10, 3, 11, 3, 12, 3, 13, 3, 4, 4, 5, 14, 6, 14, 7, 8, 9, 4, 10, 4, 11, 4, 12, 4, 13, 4, 14, 4, 5, 5, 6, 15, 7, 15, 8, 15, 9, 10, 11, 5, 12, 5, 13, 5, 14, 5, 15, 5, 6, 6
Offset: 0

Views

Author

Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Nov 09 2001

Keywords

Crossrefs

Programs

  • Haskell
    a065648 n = a065648_list !! n
    a065648_list = f (0 : a033307_list) $ take 10 $ repeat 1 where
       f (d:ds) counts = y : f ds (xs ++ (y + 1) : ys) where
                               (xs, y:ys) = splitAt d counts
    -- Reinhard Zumkeller, Aug 13 2015

Extensions

Definition and offset adjusted to follow a later change of A033307. - Reinhard Zumkeller, Aug 13 2015

A261294 a(n) = A065650(A065650(n)).

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 21, 25, 29, 12, 37, 41, 45, 49, 13, 15, 51, 65, 69, 14, 52, 81, 85, 89, 16, 17, 32, 91, 109, 18, 56, 92, 125, 129, 20, 19, 59, 35, 131, 22, 58, 96, 132, 169, 24, 23, 61, 72, 38, 171, 62, 100, 136, 172, 28, 27, 63, 103
Offset: 0

Views

Author

Reinhard Zumkeller, Aug 14 2015

Keywords

Comments

Permutation of the nonnegatve integers with inverse A261293;
a(A065649(n)) = A065649(a(n)) = A065650(n).

Crossrefs

Cf. A065650, A065649, A261293 (inverse), A261279 (fixed points).

Programs

  • Haskell
    a261294 = a065650 . a065650
Showing 1-6 of 6 results.