A010120 Smallest start for a '3x+1' sequence containing 2^n.

1, 2, 3, 3, 3, 21, 21, 75, 75, 151, 151, 1365, 1365, 5461, 5461, 14563, 14563, 87381, 87381, 184111, 184111, 932067, 932067, 5592405, 5592405, 13256071, 13256071, 26512143, 26512143, 357913941, 357913941, 1431655765, 1431655765, 3817748707

Offset

0,2

Links

Table of n, a(n) for n=0..33.

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

Formula

a(n) = A070167(A000079(n)). - Reinhard Zumkeller, Jan 02 2013

Prog

(Haskell)
a010120 = a070167 . a000079  -- Reinhard Zumkeller, Jan 02 2013

Crossrefs

Cf. A054646.

Sequence in context: A022296 A013069 A096393 * A012887 A177876 A079633

Adjacent sequences: A010117 A010118 A010119 * A010121 A010122 A010123

Keyword

nonn,nice

Author

Greg Warrington (waringtn(AT)netcom.com)

Extensions

Corrected and extended by David W. Wilson, Jun 15 1997

Status

approved