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
1, 3, 4, 7, 8, 9, 15, 16, 17, 18, 31, 32, 33, 34, 35, 63, 64, 65, 66, 67, 68, 127, 128, 129, 130, 131, 132, 133, 255, 256, 257, 258, 259, 260, 261, 262, 511, 512, 513, 514, 515, 516, 517, 518, 519, 1023, 1024, 1025, 1026, 1027, 1028, 1029, 1030, 1031, 1032, 2047 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Inspired by A127330.

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

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

PROG

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

CROSSREFS

Cf. A127330, A129143.

Sequence in context: A100452 A004201 A109054 * A075752 A046541 A324470

Adjacent sequences:  A129139 A129140 A129141 * A129143 A129144 A129145

KEYWORD

nonn,easy

AUTHOR

Klaus Brockhaus, Mar 31 2007

STATUS

approved

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 August 9 22:24 EDT 2020. Contains 336326 sequences. (Running on oeis4.)