The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A347270

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A347270

Square array T(n,k) in which row n lists the 3x+1 sequence starting at n, read by antidiagonals upwards, with n >= 1 and k >= 0.
(history; published version)

#82 by Alois P. Heinz at Sat Jun 18 19:23:09 EDT 2022

STATUS

proposed

approved

#81 by Omar E. Pol at Sat Jun 18 18:36:09 EDT 2022

STATUS

editing

proposed

#80 by Omar E. Pol at Sat Jun 18 18:34:15 EDT 2022

LINKS

Paolo Xausa, <a href="/A347270/b347270.txt">Table of n, a(n) for n = 1..11325</a> (antidiagonals 1..150 of the array, flattened)

STATUS

approved

editing

Discussion

Sat Jun 18

18:36

Omar E. Pol: Added a b-file from Paolo (private email).

#79 by Joerg Arndt at Wed Mar 02 06:14:54 EST 2022

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reviewed

approved

#78 by Michel Marcus at Wed Mar 02 03:40:42 EST 2022

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proposed

reviewed

#77 by Jean-François Alcover at Wed Mar 02 03:26:52 EST 2022

STATUS

editing

proposed

#76 by Jean-François Alcover at Wed Mar 02 03:26:47 EST 2022

MATHEMATICA

T[n_, k_] := T[n, k] = If[k == 0, n, Function[j,

If[EvenQ[j], j/2, 3*j + 1]][T[n, k - 1]]];

Table[Table[T[d - k, k], {k, 0, d - 1}], {d, 1, 20}] // Flatten (* Jean-François Alcover, Mar 02 2022, after Alois P. Heinz *)

STATUS

approved

editing

#75 by Michael De Vlieger at Tue Dec 21 11:54:28 EST 2021

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reviewed

approved

#74 by Michel Marcus at Tue Dec 21 10:48:31 EST 2021

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proposed

reviewed

#73 by Omar E. Pol at Tue Dec 21 09:06:41 EST 2021

STATUS

editing

proposed

Discussion

Tue Dec 21

09:07

Omar E. Pol: Added a Xref.