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A073189 Integers 0..k three times, then 0..k+1 three times, etc. 17
0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 6, 0, 1, 2, 3, 4, 5, 6, 0, 1, 2, 3, 4, 5, 6, 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,12

LINKS

G. C. Greubel, Rows n=0..50 of triangle, flattened

M. Somos, Sequences used for indexing triangular or square arrays

EXAMPLE

0;

0;

0;

0, 1;

0, 1;

0, 1;

0, 1, 2;

0, 1, 2;

0, 1, 2;

0, 1, 2, 3;

0, 1, 2, 3; ...

MATHEMATICA

Table[Range[0, k], {k, 0, 7}, {3}] // Flatten  (* Jean-Fran├žois Alcover, Apr 18 2013 *)

PROG

(PARI) a(n)=local(m); m=floor(sqrt(6*n+6)-3/2)\3+1; (n-3*binomial(m, 2))%m

CROSSREFS

Sequence in context: A215592 A025684 A025678 * A194519 A025855 A215590

Adjacent sequences:  A073186 A073187 A073188 * A073190 A073191 A073192

KEYWORD

nonn,tabf

AUTHOR

Michael Somos, Jul 19 2002

STATUS

approved

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Last modified February 17 14:37 EST 2019. Contains 320220 sequences. (Running on oeis4.)