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A170830 A121153 \ A005836. 3
949, 1036, 2362, 2812, 2847, 3108, 7086, 8436, 8541, 9324, 21258, 25308, 25623, 27972, 28009, 63774, 63973, 66124, 75924, 76869, 83916, 84027, 84253, 191322, 191919, 198372, 227772, 230607, 235228, 251748, 252081, 252759, 253216, 573966, 575757 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
If n is in this sequence then so is 3n. - Charlie Neder, Feb 25 2019
LINKS
PROG
(PARI) is1(n, R=divrem(3^logint(n, 3), n), S=0)={while(R[1]!=1&&!bittest(S, R[2]), S+=1<<R[2]; R=divrem(R[2]*3, n)); R[1]!=1||R[2]==0}
is2(n)={while(n, if(n%3>1, return(0)); n\=3); 1; }
for(n = 1, 1000000, if(is1(n), if(is2(n), , print(n)))) \\ Charlie Neder, Feb 26 2019, from programs for A121153 and A005836
CROSSREFS
Cf. A170853, A005836, and the Cantor set sequence A121153.
Sequence in context: A215950 A192770 A187627 * A020366 A217936 A013532
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 22 2010
EXTENSIONS
Data corrected by Charlie Neder, Feb 25 2019
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)