OFFSET
1,2
COMMENTS
Smarandache calls this a "trinary" sieve. - N. J. A. Sloane, Jan 03 2020
The asymptotic density of this sequence is Product_{k>=1} (1 - 1/3^k) = 0.560126... (A100220). - Amiram Eldar, Mar 21 2021
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..25000
Florentin Smarandache, Only Problems, Not Solutions!, 4th ed., 1993; Problem 96.
PROG
(PARI) v = List([1..118]); t=3; while (#v>=t, forstep (k=#v\t, 1, -1, listpop(v, k*t); ); t*=3; ); print (v) \\ Rémy Sigrist, Jan 05 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
R. Muller
STATUS
approved