login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A328870 Numbers whose lengths of runs of 1's in their reversed binary expansion are not weakly increasing. 2

%I #5 Nov 12 2019 19:23:22

%S 11,19,22,23,35,38,39,43,44,45,46,47,55,67,70,71,75,76,77,78,79,83,86,

%T 87,88,89,90,91,92,93,94,95,103,107,110,111,131,134,135,139,140,141,

%U 142,143,147,150,151,152,153,154,155,156,157,158,159,163,166,167

%N Numbers whose lengths of runs of 1's in their reversed binary expansion are not weakly increasing.

%e The sequence of terms together with their reversed binary expansions begins:

%e 11: (1101)

%e 19: (11001)

%e 22: (01101)

%e 23: (11101)

%e 35: (110001)

%e 38: (011001)

%e 39: (111001)

%e 43: (110101)

%e 44: (001101)

%e 45: (101101)

%e 46: (011101)

%e 47: (111101)

%e 55: (111011)

%e 67: (1100001)

%e 70: (0110001)

%e 71: (1110001)

%e 75: (1101001)

%e 76: (0011001)

%e 77: (1011001)

%e 78: (0111001)

%t Select[Range[100],!LessEqual@@Length/@Split[Join@@Position[Reverse[IntegerDigits[#,2]],1],#2==#1+1&]&]

%Y Complement of A328869.

%Y The version for prime indices is A112769.

%Y The binary expansion of n has A069010(n) runs of 1's.

%Y Cf. A000120, A003714, A014081, A164707, A245563, A304678, A328592.

%K nonn

%O 1,1

%A _Gus Wiseman_, Nov 12 2019

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 4 15:17 EDT 2024. Contains 373994 sequences. (Running on oeis4.)