login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A129142 Start with the empty sequence and append in step k the consecutive numbers 2^k-1 to 2^k+k-2. 2

%I

%S 1,3,4,7,8,9,15,16,17,18,31,32,33,34,35,63,64,65,66,67,68,127,128,129,

%T 130,131,132,133,255,256,257,258,259,260,261,262,511,512,513,514,515,

%U 516,517,518,519,1023,1024,1025,1026,1027,1028,1029,1030,1031,1032,2047

%N Start with the empty sequence and append in step k the consecutive numbers 2^k-1 to 2^k+k-2.

%C Inspired by A127330.

%e In step 4 the numbers 2^4-1 to 2^4+4-2 are appended: 15, 16, 17, 18.

%o (MAGMA) &cat[ [2^k-1..2^k+k-2]: k in [1..11] ];

%Y Cf. A127330, A129143.

%K nonn,easy

%O 1,2

%A _Klaus Brockhaus_, Mar 31 2007

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 19 21:42 EDT 2020. Contains 337184 sequences. (Running on oeis4.)