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A155029 Complement to A051731 with the identity matrix A023531 included. 2
1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

G. C. Greubel, Rows n = 1..30 of the triangle, flattened

FORMULA

T(n, k) = 0 if n==0 (mod k) otherwise 1 with T(n, n) = 1 and T(n, 1) = 0. - G. C. Greubel, Mar 07 2021

EXAMPLE

Table begins:

  1;

  0, 1;

  0, 1, 1;

  0, 0, 1, 1;

  0, 1, 1, 1, 1;

  0, 0, 0, 1, 1, 1;

  0, 1, 1, 1, 1, 1, 1;

  0, 0, 1, 0, 1, 1, 1, 1;

  0, 1, 0, 1, 1, 1, 1, 1, 1;

MATHEMATICA

Table[If[k==n, 1, If[k==0, 0, If[Mod[n, k]==0, 0, 1]]], {n, 20}, {k, n}]//Flatten (* G. C. Greubel, Mar 07 2021 *)

PROG

(Sage) flatten([[1 if k==n else 0 if (k==0 or n%k==0) else 1 for k in [1..n]] for n in [1..20]]) # G. C. Greubel, Mar 07 2021

(Magma) [k eq n select 1 else (k eq 0 or n mod k eq 0) select 0 else 1: k in [1..n], n in [1..20]]; // G. C. Greubel, Mar 07 2021

CROSSREFS

Cf. A023531, A051731, A155031.

Sequence in context: A117446 A187034 A101688 * A155031 A134540 A318962

Adjacent sequences:  A155026 A155027 A155028 * A155030 A155031 A155032

KEYWORD

nonn,tabl

AUTHOR

Mats Granvik, Jan 19 2009

STATUS

approved

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Last modified April 17 06:29 EDT 2021. Contains 343059 sequences. (Running on oeis4.)