A117970 - OEIS

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

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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