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Search: id:A109681
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| A109681 |
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"Sloping ternary numbers": write numbers in ternary under each other (right-justified), read diagonals in upward direction, convert to decimal. |
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+0
3
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| 0, 1, 5, 3, 4, 8, 6, 16, 11, 9, 10, 14, 12, 13, 17, 15, 25, 20, 18, 19, 23, 21, 22, 26, 51, 34, 29, 27, 28, 32, 30, 31, 35, 33, 43, 38, 36, 37, 41, 39, 40, 44, 42, 52, 47, 45, 46, 50, 48, 49, 53, 78, 61, 56, 54, 55, 59, 57, 58, 62, 60, 70, 65, 63, 64, 68, 66
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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All terms are distinct, but certain terms (see A109682) are missing.
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EXAMPLE
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..........0
..........1
..........2
........10
........11
........12
........20
........21
........22
......100
......101
......102
......110
......111
......112
............
The upward-sloping diagonals are:
0
1
12
10
11
22
20
121
102
100
............
giving 0, 1, 5, 3, 4, 8, 6, 16, 11, 9, 10, 14, 12, ...
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CROSSREFS
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Cf. A109682 (complement), A109683 (ternary version), A109684.
Cf. A102370(base 2 version), A103205(base 10 version).
Sequence in context: A111889 A004494 A004162 this_sequence A070367 A086308 A117967
Adjacent sequences: A109678 A109679 A109680 this_sequence A109682 A109683 A109684
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KEYWORD
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nonn,nice,easy
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Aug 08 2005
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