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!)
A256135 a(n) = 5^A000120(n). 3
1, 5, 5, 25, 5, 25, 25, 125, 5, 25, 25, 125, 25, 125, 125, 625, 5, 25, 25, 125, 25, 125, 125, 625, 25, 125, 125, 625, 125, 625, 625, 3125, 5, 25, 25, 125, 25, 125, 125, 625, 25, 125, 125, 625, 125, 625, 625, 3125, 25, 125, 125, 625, 125, 625, 625, 3125, 125, 625, 625, 3125, 625, 3125, 3125, 15625 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Also, a row of the square array A256140.

It appears that when A151780 is regarded as a triangle in which the row lengths are the powers of 2, this is what the rows converge to.

LINKS

Table of n, a(n) for n=0..63.

FORMULA

a(n) = A000351(A000120(n)). - Michel Marcus, Mar 21 2015

G.f.: Product_{k>=0} (1 + 5*x^(2^k)). - Ilya Gutkovskiy, Feb 28 2017

EXAMPLE

Also, written as an irregular triangle in which the row lengths are the terms of A011782, the sequence begins:

1;

5;

5, 25;

5, 25, 25, 125;

5, 25, 25, 125, 25, 125, 125, 625;

...

MATHEMATICA

5^# & /@ Nest[Join[#, # + 1] &, {0}, 6] (* Michael De Vlieger, Mar 20 2015, after IWABUCHI Yu(u)ki at a000120 *)

PROG

(PARI) a(n) = 5^hammingweight(n); \\ Michel Marcus, Mar 21 2015

CROSSREFS

Cf. A000120, A001316, A048883, A102376, A130667, A151780, A256140, A256141.

Sequence in context: A165826 A256693 A255458 * A227076 A223186 A071340

Adjacent sequences:  A256132 A256133 A256134 * A256136 A256137 A256138

KEYWORD

nonn

AUTHOR

Omar E. Pol, Mar 19 2015

EXTENSIONS

More terms from Michael De Vlieger, Mar 20 2015

STATUS

approved

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 August 8 09:04 EDT 2022. Contains 356005 sequences. (Running on oeis4.)