login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A145849 a(n)=A145812(2n-1) 2
1, 9, 33, 41, 129, 137, 161, 169, 513 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Every positive odd integer m==3 (mod 8) is a unique sum of the form a(s)+2a(t), while other odd integers are not expressible in this form.

LINKS

Table of n, a(n) for n=1..9.

FORMULA

If f(x)=sum_{n>=1}x^a(n), abs(x)<1, then f(x)*f(x^2)=x^3/(1-x^8).

CROSSREFS

Sequence in context: A130444 A177697 A287534 * A111045 A020226 A175440

Adjacent sequences:  A145846 A145847 A145848 * A145850 A145851 A145852

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, Oct 21 2008

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 20 04:58 EST 2018. Contains 299358 sequences. (Running on oeis4.)