A071843 Gives an LCD representation of n.

119, 17, 107, 59, 29, 62, 126, 19, 127, 63, 15249, 2193, 13713, 7569, 3729, 7953, 16145, 2449, 16273, 8081, 15339, 2283, 13803, 7659, 3819, 8043, 16235, 2539, 16363, 8171, 15291, 2235, 13755, 7611, 3771, 7995, 16187, 2491, 16315, 8123, 15261, 2205

Offset

0,1

Comments

This is based on the following way of writing "8":

|--2--|

4.....1

|--8--|

64...16

|-32--|

The powers of 2 present in the LCD representation are added. For example: n=1 gives 1 + 16 = 17. According to the position of a digit in n, [1,2,4...] is replaced by [128,256...],[16384,32768...], etc.

Links

Table of n, a(n) for n=0..41.

Prog

(Scilab) function lcd: nb: final result ndc: number of digits u: interesting digit M(i, j): (j-1)th bit of (i-1) function [nb]=lcd(n); nb=0; M=[1 1 1 0 1 1 1; 1 0 0 0 1 0 0; 1 1 0 1 0 1 1; 1 1 0 1 1 1 0; 1 0 1 1 1 0 0; 0 1 1 1 1 1 0; 0 1 1 1 1 1 1; 1 1 0 0 1 0 0; 1 1 1 1 1 1 1; 1 1 1 1 1 1 0]; if n <> 0 then ndc=int(log10(n))+1, else ndc = 1, end; for cx = ndc:-1:1; u=int(n/(10^(cx-1))); n=n-u*(10^(cx-1)); for j=0:6; nb=nb+M(u+1, j+1)*2^(j+7*(ndc-cx)), end, end; endfunction

Crossrefs

Cf. A006942 (bitcount).

Coding and glyph variations: A234691, A234692.

Sequence in context: A143776 A191949 A013683 * A234691 A252955 A171697

Adjacent sequences: A071840 A071841 A071842 * A071844 A071845 A071846

Keyword

nonn,base,easy

Author

Anonymous, Jun 08 2002

Extensions

More terms from Antonio G. Astudillo, Apr 21 2003

Status

approved