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 A257831 In decimal representation of n: replace each digit with its binary representation. 3
 0, 1, 10, 11, 100, 101, 110, 111, 1000, 1001, 10, 11, 110, 111, 1100, 1101, 1110, 1111, 11000, 11001, 100, 101, 1010, 1011, 10100, 10101, 10110, 10111, 101000, 101001, 110, 111, 1110, 1111, 11100, 11101, 11110, 11111, 111000, 111001, 1000, 1001, 10010, 10011 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS a(n) = n iff (largest digit of n) = 1: a(A007088(n)) = A007088(n); a(n) = A007088(A080719(n)). LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..10000 EXAMPLE .    n |  dec    -->  bin         |     a(n) |  A080719(n) . -----+--------------------------+----------+------------ .  100 |  [1,0,0]  |  [1,0,0]     |     100  |          4 .  101 |  [1,0,1]  |  [1,0,1]     |     101  |          5 .  102 |  [1,0,2]  |  [1,0,10]    |    1010  |         10 .  103 |  [1,0,3]  |  [1,0,11]    |    1011  |         11 .  104 |  [1,0,4]  |  [1,0,100]   |   10100  |         20 .  105 |  [1,0,5]  |  [1,0,101]   |   10101  |         21 .  106 |  [1,0,6]  |  [1,0,110]   |   10110  |         22 .  107 |  [1,0,7]  |  [1,0,111]   |   10111  |         23 .  108 |  [1,0,8]  |  [1,0,1000]  |  101000  |         40 .  109 |  [1,0,9]  |  [1,0,1001]  |  101001  |         41 .  110 |  [1,1,0]  |  [1,1,0]     |     110  |          6 .  111 |  [1,1,1]  |  [1,1,1]     |     111  |          7 .  112 |  [1,1,2]  |  [1,1,10]    |    1110  |         14 .  113 |  [1,1,3]  |  [1,1,11]    |    1111  |         15 .  114 |  [1,1,4]  |  [1,1,100]   |   11100  |         28 .  115 |  [1,1,5]  |  [1,1,101]   |   11101  |         29 .  116 |  [1,1,6]  |  [1,1,110]   |   11110  |         30 .  117 |  [1,1,7]  |  [1,1,111]   |   11111  |         31 .  118 |  [1,1,8]  |  [1,1,1000]  |  111000  |         56 .  119 |  [1,1,9]  |  [1,1,1001]  |  111001  |         57 .  120 |  [1,2,0]  |  [1,10,0]    |    1100  |         12 .  121 |  [1,2,1]  |  [1,10,1]    |    1101  |         13 .  122 |  [1,2,2]  |  [1,10,10]   |   11010  |         26 .  123 |  [1,2,3]  |  [1,10,11]   |   11011  |         27 .  124 |  [1,2,4]  |  [1,10,100]  |  110100  |         52 .  125 |  [1,2,5]  |  [1,10,101]  |  110101  |         53  . PROG (Haskell) import Data.Maybe (mapMaybe) a257831 = foldr (\b v -> 10 * v + b) 0 .            concat . mapMaybe (flip lookup bin) . a031298_row             where bin = zip [0..9] a030308_tabf (Python) def A257831(n): ....return int(''.join((format(int(d), 'b') for d in str(n)))) # Chai Wah Wu, May 10 2015 CROSSREFS Cf. A007088, A030308, A031298, A080719. Sequence in context: A303605 A266946 A081551 * A007088 A115848 A136814 Adjacent sequences:  A257828 A257829 A257830 * A257832 A257833 A257834 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, May 10 2015 STATUS approved

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Last modified June 25 07:18 EDT 2019. Contains 324347 sequences. (Running on oeis4.)