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A286709 For k>0, let bin(k) = the string corresponding to the binary representation of k, and neg(k) = bin(k) under the character substitution '0' <-> '1'; a(n) = the smallest positive integer not occurring earlier in the sequence such that bin(Sum_{k=1..n} a(k)) contains neg(n) as a substring. 2
2, 3, 4, 10, 1, 5, 7, 14, 8, 15, 11, 19, 31, 6, 24, 28, 18, 12, 50, 32, 30, 9, 21, 38, 13, 42, 63, 20, 16, 25, 64, 61, 51, 44, 27, 35, 89, 37, 87, 39, 85, 41, 83, 17, 107, 45, 79, 29, 52, 92, 75, 22, 102, 53, 71, 40, 43, 34, 23, 103, 127, 128, 62, 188, 66, 60 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

When considering bin(k), all leading zeros are removed: bin(2) = "10".

When considering neg(k), all leading zeros are preserved: neg(2) = "01".

The scatterplots of this sequence and of A160855 show similar entanglements of lines.

Partial sums are given by A286713.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, Perl program for A286709

Rémy Sigrist, Illustration of first terms

CROSSREFS

Cf. A160855, A286713.

Sequence in context: A076017 A245366 A135112 * A082865 A265348 A158929

Adjacent sequences:  A286706 A286707 A286708 * A286710 A286711 A286712

KEYWORD

nonn,base,look

AUTHOR

Rémy Sigrist, May 13 2017

STATUS

approved

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Last modified October 1 12:45 EDT 2022. Contains 357147 sequences. (Running on oeis4.)