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A293764 Numbers k such that (d(k), d(k+1)) = (1,1) in the base-2 digits d(i) of sqrt(2). 4
3, 17, 18, 19, 23, 27, 31, 32, 33, 34, 35, 36, 40, 41, 44, 45, 46, 50, 68, 74, 75, 76, 77, 80, 88, 91, 95, 98, 99, 115, 116, 117, 118, 124, 125, 126, 127, 132, 133, 138, 141, 142, 143, 146, 155, 156, 171, 172, 175, 176, 189, 193, 194, 197, 206, 207, 208, 213 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This sequence together with A293761, A293762, and A293763 partition the positive integers.

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000

EXAMPLE

(d(i)) = (1,0,1,1,0,1,0,1,0,0,0,0,0,1,...) = A004539, in which (0,1) first occurs as (a(3),a(4)).

MATHEMATICA

z = 100; s = StringJoin[Map[ToString, First[RealDigits[N[Sqrt[2], 10000], 2]]]];

Take[Map[#[[1]]&, StringPosition[s, "00"]], z] (*A293761*)

Take[Map[#[[1]]&, StringPosition[s, "01"]], z] (*A293762*)

Take[Map[#[[1]]&, StringPosition[s, "10"]], z] (*A293763*)

Take[Map[#[[1]]&, StringPosition[s, "11"]], z] (*A293764*)

(* Peter J. C. Moses, Oct 15 2017 *)

CROSSREFS

Cf. A004539, A293761, A293762, A293763.

Sequence in context: A195999 A059189 A043066 * A295395 A246143 A101144

Adjacent sequences:  A293761 A293762 A293763 * A293765 A293766 A293767

KEYWORD

nonn,easy,base

AUTHOR

Clark Kimberling, Oct 19 2017

STATUS

approved

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Last modified December 16 14:48 EST 2018. Contains 318167 sequences. (Running on oeis4.)