A118275 - OEIS

A118275

a(0) = 1. a(n) is the number of times the binary representation of a(n-1) appears in the concatenated string of the terms a(0) through a(n-1) written in binary. (The concatenated string is written from left to right and each binary integer is written so the most significant 1 is on the left.)

1, 1, 2, 1, 4, 1, 6, 3, 6, 4, 2, 6, 5, 6, 6, 7, 6, 8, 1, 29, 6, 10, 5, 14, 8, 2, 20, 4, 6, 12, 2, 26, 6, 15, 6, 16, 1, 65, 1, 68, 1, 71, 2, 36, 2, 39, 2, 41, 5, 28, 2, 46, 3, 50, 3, 53, 5, 35, 3, 60, 3, 65, 2, 57, 4, 23, 12, 13, 22, 10

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

Sequence A118274 is the string of terms of this sequence written in binary and concatenated.

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 0..10000

EXAMPLE

The string of concatenated binary representations of a(0) through a(7) is

11101100111011. Now a(7)= 3, which is 11 in binary. '11' occurs 6 times in the string (with, in this case, some binary digits in the string being used more than once). (The six '11's occur at {with position 1 on the left} positions 1, 2, 5, 9, 10 and 13.) So a(8) = 6. (And '1,1,0' is appended to the end of sequence A118274.)

MAPLE

with(StringTools): a[0]:=1: str:="1": pstr:="1":for n from 1 to 70 do a[n] := nops({SearchAll(pstr, str)}): pstr := convert(convert(a[n], binary), string): str := cat(str, pstr): printf("%d, ", a[n-1]):od: # Nathaniel Johnston, Apr 20 2011

CROSSREFS

Cf. A118274.

Sequence in context: A339602 A277127 A332792 * A328612 A243824 A146938

Adjacent sequences: A118272 A118273 A118274 * A118276 A118277 A118278

KEYWORD

easy,nonn,base

AUTHOR

Leroy Quet, Apr 21 2006

EXTENSIONS

a(14) - a(69) from Nathaniel Johnston, Apr 20 2011

STATUS

approved