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A144481 A078371(n-1) mod 9. 1
5, 3, 0, 5, 0, 3, 5, 6, 6, 5, 3, 0, 5, 0, 3, 5, 6, 6, 5, 3, 0, 5, 0, 3, 5, 6, 6, 5, 3, 0, 5, 0, 3, 5, 6, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Related to the Pell equation and the Balmer spectrum of hydrogen.

LINKS

Table of n, a(n) for n=1..36.

FORMULA

Period length 9: a(n+9)=a(n).

a(n)=(1/108)*{23*(n mod 9)+11*[(n+1) mod 9]-[(n+2) mod 9]-13*[(n+3) mod 9]-25*[(n+4) mod 9]+71*[(n+5) mod 9]-49*[(n+6) mod 9]+47*[(n+7) mod 9]+35*[(n+8) mod 9]}, with n>=0 [From Paolo P. Lava, Oct 13 2008]

CROSSREFS

Sequence in context: A077602 A238008 A193547 * A232225 A200126 A065469

Adjacent sequences:  A144478 A144479 A144480 * A144482 A144483 A144484

KEYWORD

nonn

AUTHOR

Paul Curtz, Oct 12 2008

EXTENSIONS

Edited by R. J. Mathar, Dec 08 2008

STATUS

approved

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Last modified March 26 20:37 EDT 2019. Contains 321534 sequences. (Running on oeis4.)