|
| |
|
|
A132140
|
|
Numbers containing no zeros in ternary representation and with an initial 1.
|
|
5
| |
|
|
1, 4, 5, 13, 14, 16, 17, 40, 41, 43, 44, 49, 50, 52, 53, 121, 122, 124, 125, 130, 131, 133, 134, 148, 149, 151, 152, 157, 158, 160, 161, 364, 365, 367, 368, 373, 374, 376, 377, 391, 392, 394, 395, 400, 401, 403, 404, 445, 446, 448, 449, 454, 455, 457, 458, 472
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| Intersection of A032924 and A132141;
A132138(A132139(a(n))) = 1.
|
|
|
LINKS
| R. Zumkeller, Table of n, a(n) for n = 1..10000
|
|
|
EXAMPLE
| 14 is in the sequence because its ternary representation is 112; 15 is not in the sequence because its ternary representation is 120.
|
|
|
MAPLE
| a:=proc(n) local nn, L: nn:=convert(n, base, 3): L:=nops(nn): if nn[L]=1 and 0 < product(nn[j], j=1..L) then n else end if end proc: seq(a(n), n=1..500); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Sep 09 2007
|
|
|
CROSSREFS
| Cf. A007089.
Sequence in context: A123102 A028272 A003969 * A102703 A156638 A098868
Adjacent sequences: A132137 A132138 A132139 * A132141 A132142 A132143
|
|
|
KEYWORD
| nonn,base
|
|
|
AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 20 2007
|
| |
|
|
