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
Links
- Rémy Sigrist, Table of n, a(n) for n = 0..10000
- Eric Weisstein's World of Mathematics, Ternary
Programs
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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
Extensions
Edited by Charles R Greathouse IV, Aug 05 2010
a(0) = 0 prepended by Rémy Sigrist, Dec 20 2019