

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).


13



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



