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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A199923 Sum_{0<=k<=3^(n-1)} gcd(k,3^(n-1)) for n > 0 and a(0) = 1. 2
1, 2, 8, 30, 108, 378, 1296, 4374, 14580, 48114, 157464, 511758, 1653372, 5314410, 17006112, 54206982, 172186884, 545258466, 1721868840, 5423886846, 17046501516 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

FORMULA

a(n) are the row sums of A199922.

EXAMPLE

a(3) = 9 + 1 + 1 + 3 + 1 + 1 + 3 + 1 + 1 + 9.

CROSSREFS

Sequence in context: A230701 A168605 A127865 * A230269 A278023 A077839

Adjacent sequences:  A199920 A199921 A199922 * A199924 A199925 A199926

KEYWORD

nonn

AUTHOR

Peter Luschny, Nov 12 2011

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 May 24 17:16 EDT 2019. Contains 323533 sequences. (Running on oeis4.)