login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A083673 First differences have period 6: 2,-1,3,4,-3,7, 2,-1,3,4,-3,7, 2,-1,... 0
2, 4, 3, 6, 10, 7, 14, 16, 15, 18, 22, 19, 26, 28, 27, 30, 34, 31, 38, 40, 39, 42, 46, 43, 50, 52, 51, 54, 58, 55, 62, 64, 63, 66, 70, 67, 74, 76, 75, 78, 82, 79, 86, 88, 87, 90, 94, 91, 98, 100, 99, 102, 106, 103, 110, 112, 111, 114, 118, 115, 122, 124, 123, 126, 130, 127, 134, 136 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Note: not all quizzes permit the use of the OEIS!

LINKS

Table of n, a(n) for n=1..68.

C. P. Simoes, Teste de Desempenho Mental.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,1,-1).

FORMULA

a(n+6) = a(n) + 12.

a(n) = -5+Sum_{k=0..n}{(1/30)*(-46*(k mod 6)+39*((k+1) mod 6)-((k+2) mod 6)-16*((k+3) mod 6)+19*((k+4) mod 6)+29*((k+5) mod 6)} - Paolo P. Lava, Aug 29 2007

a(n) = a(n-1)+a(n-6)-a(n-7). G.f.: x*(5*x^6-3*x^5+4*x^4+3*x^3-x^2+2*x+2) / ((x-1)^2*(x+1)*(x^2-x+1)*(x^2+x+1)). - Colin Barker, Jul 31 2013

MATHEMATICA

LinearRecurrence[{1, 0, 0, 0, 0, 1, -1}, {2, 4, 3, 6, 10, 7, 14}, 70] (* Harvey P. Dale, Jan 16 2015 *)

CROSSREFS

Sequence in context: A333029 A175498 A318452 * A327120 A131388 A131393

Adjacent sequences:  A083670 A083671 A083672 * A083674 A083675 A083676

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jun 15 2003

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 December 4 21:58 EST 2020. Contains 338941 sequences. (Running on oeis4.)