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

Author

Greg Warrington (waringtn(AT)netcom.com)

Keywords

• nonn
• nice

Links

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

Crossrefs

Cf. A054646.

Programs

Haskell

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

Formula

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

Extensions

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