cp's OEIS Frontend

A051127 Table T(n,k) = k mod n read by antidiagonals (n >= 1, k >= 1).

%I A051127 #40 Jul 02 2025 16:01:58
%S A051127 0,0,1,0,0,1,0,1,2,1,0,0,0,2,1,0,1,1,3,2,1,0,0,2,0,3,2,1,0,1,0,1,4,3,
%T A051127 2,1,0,0,1,2,0,4,3,2,1,0,1,2,3,1,5,4,3,2,1,0,0,0,0,2,0,5,4,3,2,1,0,1,
%U A051127 1,1,3,1,6,5,4,3,2,1,0,0,2,2,4,2,0,6,5,4,3,2,1,0,1,0,3,0,3,1,7,6,5,4,3,2,1
%N A051127 Table T(n,k) = k mod n read by antidiagonals (n >= 1, k >= 1).
%C A051127 Note that the upper right half of this sequence when formatted as a square array is essentially the same as this whole sequence when formatted as an upper right triangle. Sums of antidiagonals are A004125. - _Henry Bottomley_, Jun 22 2001
%H A051127 Boris Putievskiy, <a href="http://arxiv.org/abs/1212.2732">Transformations Integer Sequences And Pairing Functions</a>, arXiv:1212.2732 [math.CO], 2012.
%F A051127 As a linear array, the sequence is a(n) = A004736(n) mod A002260(n) or a(n) = ((t*t+3*t+4)/2-n) mod (n-(t*(t+1)/2)), where t = floor((-1+sqrt(8*n-7))/2). - _Boris Putievskiy_, Dec 17 2012
%F A051127 G.f. for the n-th row: y*Sum_{i=0..n-2} (i + 1)*y^i/(1 - y^n). - _Stefano Spezia_, May 08 2024
%e A051127 0  0  0  0  0  0  0  0  0  0 ...
%e A051127 1  0  1  0  1  0  1  0  1  0 ...
%e A051127 1  2  0  1  2  0  1  2  0  1 ...
%e A051127 1  2  3  0  1  2  3  0  1  2 ...
%e A051127 1  2  3  4  0  1  2  3  4  0 ...
%e A051127 1  2  3  4  5  0  1  2  3  4 ...
%e A051127 1  2  3  4  5  6  0  1  2  3 ...
%e A051127 1  2  3  4  5  6  7  0  1  2 ...
%e A051127 1  2  3  4  5  6  7  8  0  1 ...
%e A051127 1  2  3  4  5  6  7  8  9  0 ...
%e A051127 1  2  3  4  5  6  7  8  9 10 ...
%e A051127 1  2  3  4  5  6  7  8  9 10 ...
%e A051127 1  2  3  4  5  6  7  8  9 10 ...
%t A051127 T[n_, m_] = Mod[n - m + 1, m + 1]; Table[Table[T[n, m], {m, 0, n}], {n, 0, 10}]; Flatten[%] (* _Roger L. Bagula_, Sep 04 2008 *)
%o A051127 (PARI) T(n, k)=k%n \\ _Charles R Greathouse IV_, Feb 09 2017
%Y A051127 Transpose of A051126.
%Y A051127 Cf. A048158, A051777, A122750.
%Y A051127 Cf. A002260, A004125, A004736.
%K A051127 nonn,tabl,easy,nice
%O A051127 1,9
%A A051127 _N. J. A. Sloane_
%E A051127 More terms from _James Sellers_, Dec 11 1999