A057946 Bad hexadecimal notation for n: write n in hexadecimal notation, replacing digit ten with "10", digit eleven with "11", ... and digit fifteen with "15".

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 110, 111, 112, 113, 114, 115, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 210, 211, 212, 213, 214, 215, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 310, 311, 312, 313, 314, 315, 40, 41

Offset: 0

Author

Henry Bottomley, Oct 13 2000

Keywords

• base
• dumb
• easy
• nonn

Examples

			a(15)=15 since it is represented by the digit "15" base 16. a(21)=15 since it is represented by the digit "1" followed by the digit "5" base 16.
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A057947 for ambiguous numbers, A055645 for a better representation of hexadecimal.

Programs

Maple

a:= proc(n) local i, m, r ; m:=n; r:=NULL;
      if n=0 then return 0 fi;
      for i from 0 while m>0 do
        r:= irem(m, 16, 'm'), r
      od; parse(cat(r))
    end:
seq(a(n), n=0..80);  # Alois P. Heinz, Jun 23 2014

Mathematica

f[n_] := FromDigits@ Flatten@ IntegerDigits@ IntegerDigits[n, 16]; Array[f, 66, 0] (* Robert G. Wilson v, Jun 23 2014 *)