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!)
A114001 Rows of A114000 expressed as decimals (a sequence related to the number of divisors of 2n-1). 3

%I #16 Dec 04 2023 06:38:08

%S 1,3,5,9,25,33,65,225,257,513,1665,2049,5121,12801,16385,32769,100353,

%T 180225,262145,794625,1048577,2097153,7634945,8388609,18874369,

%U 50462721,67108865,171966465,403177473,536870913,1073741825

%N Rows of A114000 expressed as decimals (a sequence related to the number of divisors of 2n-1).

%H Paolo Xausa, <a href="/A114001/b114001.txt">Table of n, a(n) for n = 0..1000</a>

%e a(5)=25 converts to 11001 in binary, which has sum of digits equal to 3, and 9=2*5-1 has 3 divisors.

%t A114001[n_]:=FromDigits[Boole[Divisible[2n+1,2Range[0,n]+1]],2];

%t Array[A114001,50,0] (* _Paolo Xausa_, Dec 04 2023 *)

%Y Cf. A114000, A099774 (binary weight), A339916 (bit reversal).

%K easy,nonn

%O 0,2

%A _Paul Barry_, Nov 12 2005

%E Edited by _N. J. A. Sloane_, Dec 23 2020

%E Offset changed to 0 by _Paolo Xausa_, Dec 04 2023

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 March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)