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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A047580 Numbers that are congruent to {1, 2, 5, 6, 7} mod 8. 1
1, 2, 5, 6, 7, 9, 10, 13, 14, 15, 17, 18, 21, 22, 23, 25, 26, 29, 30, 31, 33, 34, 37, 38, 39, 41, 42, 45, 46, 47, 49, 50, 53, 54, 55, 57, 58, 61, 62, 63, 65, 66, 69, 70, 71, 73, 74, 77, 78, 79, 81, 82, 85, 86, 87, 89 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..1000

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

FORMULA

From Chai Wah Wu, May 30 2016: (Start)

a(n) = a(n-1) + a(n-5) - a(n-6), for n > 6.

G.f.: x*(x^5 + x^4 + x^3 + 3*x^2 + x + 1)/(x^6 - x^5 - x + 1). (End)

MATHEMATICA

Select[Range[100], MemberQ[{1, 2, 5, 6, 7}, Mod[#, 8]]&] (* Harvey P. Dale, Jan 16 2013 *)

LinearRecurrence[{1, 0, 0, 0, 1, -1}, {1, 2, 5, 6, 7, 9}, 50] (* G. C. Greubel, May 30 2016 *)

CROSSREFS

Sequence in context: A193260 A161539 A177859 * A153384 A102657 A202115

Adjacent sequences:  A047577 A047578 A047579 * A047581 A047582 A047583

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

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 July 12 22:46 EDT 2020. Contains 335669 sequences. (Running on oeis4.)