

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
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OFFSET

1,2


COMMENTS

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


REFERENCES

R. E. Maeder, Programming in Mathematica, 3rd Edition, AddisonWesley, pages 251252.


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



