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A141446 A102055(n) mod 9. 1
1, 2, 1, 4, -4, 7, -5, 8, -5, 4, -7, 1, -5, 5, -2, 4, -1, 4, -5, 2, -8, 4, -4, 7, -5, 8, -5, 4, -7, 1, -5, 5, -2, 4, -1, 4, -5, 2, -8, 4, -4, 7, -5, 8, -5, 4, -7, 1, -5, 5, -2, 4, -1, 4, -5, 2, -8, 4, -4, 7, -5, 8, -5, 4, -7, 1, -5, 5, -2, 4, -1, 4, -5, 2, -8, 4, -4, 7, -5, 8, -5, 4, -7, 1, -5, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

We compute the positive remainder modulo 9 and subtract 9 if A102055(n) is negative.

Appears to be periodic with period length 18 after the transitional first 3 elements. (This would imply only the same 6 digits appear as found in A141425.)

LINKS

Table of n, a(n) for n=0..85.

FORMULA

a(3n) + a(3n+1) + a(3n+2) = 4, 7, -2, -2, -2, 5 ever same six digits?

MAPLE

A102055 := proc(n) local k; if n = 0 then 1; else 1-add(A001469(k), k=1..n) ; end if; end proc:

A141446 := proc(n) local a; a := A102055(n) ; if a > 0 then a mod  9; else (a mod  9)-9; end if; end proc; # R. J. Mathar, Jul 07 2011

CROSSREFS

Cf. A141430.

Sequence in context: A308034 A289918 A127480 * A077965 A077967 A296188

Adjacent sequences:  A141443 A141444 A141445 * A141447 A141448 A141449

KEYWORD

sign

AUTHOR

Paul Curtz, Aug 07 2008

STATUS

approved

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Last modified July 21 22:02 EDT 2019. Contains 325210 sequences. (Running on oeis4.)