A117970 Position of first 0 counting from the least significant digit in the ternary expansion of 2^n.

0, 0, 0, 0, 0, 3, 2, 2, 4, 4, 5, 4, 2, 2, 4, 0, 3, 4, 2, 2, 3, 3, 8, 3, 2, 2, 5, 5, 6, 5, 2, 2, 11, 4, 3, 5, 2, 2, 3, 3, 11, 3, 2, 2, 5, 8, 4, 5, 2, 2, 13, 5, 3, 5, 2, 2, 3, 3, 4, 3, 2, 2, 4, 4, 7, 4, 2, 2, 4, 6, 3, 4, 2, 2, 3, 3, 7, 3, 2, 2, 6, 6, 7, 6, 2, 2, 10, 4, 3, 7, 2, 2, 3, 3, 5, 3, 2, 2, 11, 5, 4, 17

Offset

0,6

Links

Rémy Sigrist, Table of n, a(n) for n = 0..10000

Eric Weisstein's World of Mathematics, Ternary

Prog

(PARI) a(n) = { my (p=2^n); for (k=1, oo, if (p==0, return (0), p%3==0, return (k), p\=3)) } \\ Rémy Sigrist, Dec 20 2019

Crossrefs

Cf. A004642, A102483, A104320, A117971.

Sequence in context: A308190 A235354 A058743 * A364846 A298904 A308194

Adjacent sequences: A117967 A117968 A117969 * A117971 A117972 A117973

Keyword

nonn,base

Author

Eric W. Weisstein, Apr 06 2006

Extensions

Edited by Charles R Greathouse IV, Aug 05 2010

a(0) = 0 prepended by Rémy Sigrist, Dec 20 2019

Status

approved