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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A194350 Numbers covering A000027: a(n)=(1, 1, 2, 5) * A011557(n)). 0
1, 1, 2, 5, 10, 10, 20, 50, 100, 100, 200, 500, 1000, 1000, 2000, 5000, 10000, 10000, 20000, 50000, 100000, 100000, 200000, 500000, 1000000, 1000000, 2000000, 5000000, 10000000, 10000000, 20000000, 50000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

3=1+2, 4=1+1+2, 6=1+5, 7=2+5, 8=1+2+5, 9=1+1+2+5, 11=1+10, 12=2+10, 13=1+2+10.

a(n) is used only once. Like weights.

LINKS

Table of n, a(n) for n=1..32.

Index entries for linear recurrences with constant coefficients, signature (0,0,0,10).

FORMULA

a(1)=1, a(2)=1, a(3)=2, a(4)=5, a(n)=10*a(n-4). G.f.: x*(1+x+2*x^2+5*x^3)/(1-10*x^4). [Colin Barker, Jan 25 2012]

MATHEMATICA

LinearRecurrence[{0, 0, 0, 10}, {1, 1, 2, 5}, 40] (* Harvey P. Dale, Jan 21 2019 *)

PROG

(PARI) a(n)=10^(n\4)*[1/2, 1, 1, 2][n%4+1] \\ Charles R Greathouse IV, Dec 21 2011

CROSSREFS

Sequence in context: A097378 A078310 A138848 * A182179 A123466 A144793

Adjacent sequences:  A194347 A194348 A194349 * A194351 A194352 A194353

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, Aug 22 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 August 20 10:05 EDT 2019. Contains 326149 sequences. (Running on oeis4.)