The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A066117 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A066117

Triangle read by rows: T(n,k) = T(n-1,k-1)*T(n,k-1) and T(n,1) = prime(n).
(history; published version)

#24 by Michael De Vlieger at Wed Jul 27 16:36:26 EDT 2022

STATUS

proposed

approved

#23 by Peter Munn at Wed Jul 27 13:42:36 EDT 2022

STATUS

editing

proposed

#22 by Peter Munn at Wed Jul 27 13:31:51 EDT 2022

COMMENTS

As a square array read by descending antidiagonals, A(n, k), n >= 1, k >= 1, gives the encoding defined in A297845 of the polynomial (x+1)^(n-1) * x^(k-1). - Peter Munn, Jul 27 2022

#21 by Peter Munn at Wed Jul 20 15:47:01 EDT 2022

FORMULA

A(1,1) = 2; for n > 1, A(n,k) = A297845(A(n-1,k),6); for k > 1, A(n,k) = A297845(A(n,k-1),3). - Peter Munn, Jul 20 2022

CROSSREFS

Cf. A003961, A055396, A297845.

STATUS

approved

editing

#20 by Alois P. Heinz at Mon Nov 13 17:02:15 EST 2017

STATUS

reviewed

approved

#19 by Wesley Ivan Hurt at Mon Nov 13 16:19:03 EST 2017

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proposed

reviewed

#18 by Jean-François Alcover at Mon Nov 13 16:07:57 EST 2017

STATUS

editing

proposed

#17 by Jean-François Alcover at Mon Nov 13 16:07:52 EST 2017

MATHEMATICA

T[n_, 1] := Prime[n];

T[n_, k_] := T[n, k] = T[n - 1, k - 1]*T[n, k - 1];

Table[T[n, k], {n, 1, 7}, {k, 1, n}] // Flatten (* Jean-François Alcover, Nov 13 2017 *)

STATUS

approved

editing

#16 by N. J. A. Sloane at Tue Sep 20 13:20:55 EDT 2016

STATUS

proposed

approved

#15 by Antti Karttunen at Mon Sep 19 11:36:46 EDT 2016

STATUS

editing

proposed