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A033492 Record number of steps to reach 1 in '3x+1' problem, corresponding to starting values in A006877 (same as A006878 except here we start counting at 1 instead of 0). 9
1, 2, 8, 9, 17, 20, 21, 24, 112, 113, 116, 119, 122, 125, 128, 131, 144, 145, 171, 179, 182, 183, 209, 217, 238, 262, 268, 276, 279, 282, 308, 311, 324, 340, 351, 354, 375, 383, 386, 443, 449, 470, 509, 525, 528, 531, 557, 560, 563, 584, 597, 613, 665, 686 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Both the 3x+1 steps and the halving steps are counted.

REFERENCES

R. E. Maeder, Programming in Mathematica, 3rd Edition, Addison-Wesley, pages 251-252.

LINKS

T. D. Noe, Table of n, a(n) for n=1..130 (from Eric Roosendaal's data)

Eric Roosendaal, 3x+1 Delay Records

Index entries for sequences related to 3x+1 (or Collatz) problem

CROSSREFS

Equal to A006878 + 1. Cf. A006884, A006885, A033492.

Sequence in context: A105125 A230314 A220263 * A126160 A118962 A096033

Adjacent sequences: A033489 A033490 A033491 * A033493 A033494 A033495

KEYWORD

nonn

AUTHOR

Jeff Burch

EXTENSIONS

Corrected and extended by Lee Corbin (lcorbin(AT)tsoft.com)

More terms from Larry Reeves (larryr(AT)acm.org), Apr 27 2001

STATUS

approved

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Last modified December 7 22:02 EST 2022. Contains 358671 sequences. (Running on oeis4.)