The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A033958

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A033958

In the '3x+1' problem, these values for the starting value set new records for number of steps to reach 1.
(history; published version)

#36 by Susanna Cuyler at Fri Apr 01 09:13:09 EDT 2022

STATUS

proposed

approved

#35 by Michel Marcus at Fri Apr 01 04:05:00 EDT 2022

STATUS

editing

proposed

#34 by Michel Marcus at Fri Apr 01 04:04:57 EDT 2022

REFERENCES

B. Hayes, Computer Recreations: On the ups and downs of hailstone numbers, Scientific American, 250 (No. 1, 1984), pp. 10-16.

LINKS

Brian Hayes, <a href="https://www.jstor.org/stable/24969271">Computer Recreations: On the ups and downs of hailstone numbers</a>, Scientific American, 250 (No. 1, 1984), pp. 10-16.

STATUS

approved

editing

#33 by Alois P. Heinz at Wed Jul 22 19:47:27 EDT 2020

STATUS

proposed

approved

#32 by Sean A. Irvine at Wed Jul 22 19:28:16 EDT 2020

STATUS

editing

proposed

#31 by Sean A. Irvine at Wed Jul 22 19:28:03 EDT 2020

FORMULA

Positions of records in A006667. - Sean A. Irvine, Jul 22 2020

STATUS

approved

editing

#30 by Alois P. Heinz at Tue Oct 22 19:45:43 EDT 2019

STATUS

proposed

approved

#29 by Joerg Arndt at Tue Oct 22 10:32:48 EDT 2019

STATUS

editing

proposed

#28 by Joerg Arndt at Tue Oct 22 10:32:22 EDT 2019

MAPLE

A033958 := proc(n) local a, L; L := 0; a := n; while a <> 1 do if a mod 2 = 0 then a := a/2; else a := 3*a+1; L := L+1; fi; od: RETURN(L); end;

STATUS

proposed

editing

Discussion

Tue Oct 22

10:32

Joerg Arndt: Maple code was a lie, I removed it.

#27 by Michel Marcus at Tue Oct 22 01:24:00 EDT 2019

STATUS

editing

proposed