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Search: id:A082189
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| A082189 |
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In the following square array, numbers (not occurring earlier) are entered like this a(1,1),a(1,2),a(2,1),a(3,1),a(2,2),a(1,3),a(1,4),a(2,3),a(3,2),a(4,1),a(5,1),a(4,2),... such that every entry is coprime to its neighbor in all directions. 1 2 7 6 23 10... 3 5 11 19... 4 13 12... 9 17 ... 8... ... e.g. a(2,2) = 5 and its neighbors are 1,2,7,11,12,13,4, and 3 which are co- prime to 5. Sequence contains the main diagonal. |
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+0
5
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| 1, 5, 12, 41, 26, 103, 58, 181, 92, 293, 128, 439, 174, 617, 230, 817, 290, 1037, 376
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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In the following square array, numbers (not occurring earlier) are entered like this a(1,1),a(1,2),a(2,1),a(3,1),a(2,2),a(1,3),a(1,4),a(2,3),a(3,2),a(4,1),a(5,1),a(4,2),... such that every entry is coprime to its neighbor in all directions.
1 2 7 6 23 10...
3 5 11 19...
4 13 12...
9 17 ...
8...
...
Sequence contains the main diagonal.
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CROSSREFS
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Cf. A082025, A082187, A082188, A082190.
Adjacent sequences: A082186 A082187 A082188 this_sequence A082190 A082191 A082192
Sequence in context: A028322 A092772 A120779 this_sequence A129795 A052644 A052280
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KEYWORD
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more,nonn,uned
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 07 2003
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