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Search: id:A082188
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| A082188 |
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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 first column. |
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5
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| 1, 3, 4, 9, 8, 27, 14, 39, 22, 57, 32, 81, 46, 105, 64, 147, 82, 189, 104, 225, 124, 273, 142, 315, 166, 345, 194, 375, 224, 465
(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 first column.
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CROSSREFS
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Cf. A082025, A082187, A082189, A082190.
Adjacent sequences: A082185 A082186 A082187 this_sequence A082189 A082190 A082191
Sequence in context: A022463 A106833 A076120 this_sequence A095047 A079258 A134025
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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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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 06 2006
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