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Search: id:A102355
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| A102355 |
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Any digit "d" (except the first two) is the absolute difference between x and y -> x=sum of the 2 digits standing immediately to the left of "d", y=sum of the 2 digits standing immediately to the right of "d". |
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+0
1
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| 0, 1, 2, 120, 121, 201, 2120, 12120, 121201, 212012, 12012120, 12120121, 20121201, 212012120, 1212012120, 12120121201, 21201212012, 1201212012120, 1212012120121, 2012120121201, 21201212012120, 121201212012120
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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To build such sequences, repeat one of those three patterns and insert commas accordingly: i) 0aaaa -> 0aaaa0aaaa0aaaa... -> 0,1,11,101,1110,11110... j) 0abab -> 0abab0abab0abab... -> 0,4,9,490,494,904,9490... k) 0a00a -> 0a00a0a00a0a00a... -> 0,700,70700,7070070,...
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EXAMPLE
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The first "2" is the absolute difference (0+1)-(1+2);
the following "1" is the result of (2+1)-(2+0);
the following "2" is the result of (1+2)-(0+1);
the following "0" is the result of (1+2)-(1+2)...
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CROSSREFS
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Sequence in context: A103851 A024030 A073785 this_sequence A077540 A024343 A100043
Adjacent sequences: A102352 A102353 A102354 this_sequence A102356 A102357 A102358
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KEYWORD
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base,easy,nonn
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AUTHOR
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Eric Angelini (eric.angelini(AT)kntv.be), Feb 21 2005
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