The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A306944 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A306944

a(n) = number of iterations of x -> A306938(x) required to reach 1 when started at n, or -1 if the trajectory of n never reaches 1.
(history; published version)

#22 by Peter Luschny at Wed Mar 20 06:32:44 EDT 2019

STATUS

reviewed

approved

#21 by Michel Marcus at Tue Mar 19 04:54:58 EDT 2019

STATUS

proposed

reviewed

#20 by Amiram Eldar at Mon Mar 18 05:31:14 EDT 2019

STATUS

editing

proposed

#19 by Amiram Eldar at Mon Mar 18 05:29:15 EDT 2019

COMMENTS

te Riele noted that of the first initial values <= 10^5 only 459 have a trajectory that reaches 1. The number of terms <= 10^k that reach 1 for k = 1, 2, ... are 7, 23, 63, 175, 459, 1349, 3506, ... - Amiram Eldar, Mar 17 2019

STATUS

proposed

editing

Discussion

Mon Mar 18

05:31

Amiram Eldar: Please ignore my previous comment. I have created a new draft for it (A306971).

#18 by Amiram Eldar at Sun Mar 17 17:01:30 EDT 2019

STATUS

editing

proposed

#17 by Amiram Eldar at Sun Mar 17 17:01:03 EDT 2019

COMMENTS

te Riele noted that of the first initial values <= 10^5 only 459 have a trajectory that reaches 1. The number of terms > -1 below <= 10^k that reach 1 for k = 1, 2, ... are 7, 23, 63, 175, 459, 1349, 3506, ... - Amiram Eldar, Mar 17 2019

STATUS

proposed

editing

#16 by Amiram Eldar at Sun Mar 17 16:38:48 EDT 2019

STATUS

editing

proposed

Discussion

Sun Mar 17

16:55

Amiram Eldar: Maybe the sequence I gave in the comments (7, 23, 63, 175, 459, 1349, 3506, ...) is interesting enough for an sequence entry of itself?

#15 by Amiram Eldar at Sun Mar 17 16:38:41 EDT 2019

NAME

a(n) = number of iterations of x -> A306936A306938(x) required to reach 1 when started at n, or -1 if the trajectory of n never reaches 1.

STATUS

proposed

editing

#14 by Amiram Eldar at Sun Mar 17 16:38:01 EDT 2019

STATUS

editing

proposed

#13 by Amiram Eldar at Sun Mar 17 16:36:26 EDT 2019

COMMENTS

te Riele noted that of the first initial values <= 10^5 only 459 have a trajectory that reaches 1. The number of terms > -1 below 10^k for k = 1, 2, ... are 7, 23, 63, 175, 459, 1349, 3506, ... - Amiram Eldar, Mar 17 2019