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A014885

n is equal to the number of 1's in all numbers <= n written in base 8.

1, 8177, 8178, 8179, 8180, 8181, 8182, 8183, 8184, 8192, 8193, 49137, 49138, 49139, 49140, 49141, 49142, 49143, 49144, 90112, 90113, 322096, 1048576, 1048577, 1056753, 1056754, 1056755, 1056756, 1056757, 1056758, 1056759, 1056760, 1056768, 1056769, 1097713, 1097714, 1097715, 1097716, 1097717, 1097718, 1097719, 1097720, 1138688, 1138689, 2396744

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..45.

MAPLE

T:= 0: R:= NULL:

for n from 1 to (8^8-1)/(8-1) do

T:= T + numboccur(1, convert(n, base, 8));

if T = n then R:= R, n; count:= count+1;

fi od:

R; # Robert Israel, Dec 01 2020

MATHEMATICA

Module[{nn=106*10^4, n1s}, n1s=Accumulate[Table[DigitCount[n, 8, 1], {n, nn}]]; Position[Thread[{n1s, Range[nn]}], _?(#[[1]]==#[[2]]&), 1, Heads-> False]]// Flatten (* Harvey P. Dale, Feb 28 2020 *)

CROSSREFS

Cf. A014778.

Sequence in context: A096329 A126823 A205092 * A252217 A351448 A235095

Adjacent sequences: A014882 A014883 A014884 * A014886 A014887 A014888

KEYWORD

nonn,base,fini,full

AUTHOR

Olivier Gérard

STATUS

approved

URL: https://oeis.org/A014885

⇱ A014885 - OEIS