A102355 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".

0, 1, 2, 120, 121, 201, 2120, 12120, 121201, 212012, 12012120, 12120121, 20121201, 212012120, 1212012120, 12120121201, 21201212012, 1201212012120, 1212012120121, 2012120121201, 21201212012120, 121201212012120

Offset

0,3

Comments

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,...

Links

Table of n, a(n) for n=0..21.

Example

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)...

Crossrefs

Sequence in context: A165163 A153658 A073785 * A206355 A360607 A157069

Adjacent sequences: A102352 A102353 A102354 * A102356 A102357 A102358

Keyword

base,easy,nonn

Author

Eric Angelini, Feb 21 2005

Status

approved