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Search: id:A082231
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| A082231 |
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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 partial sum (n>1) of the rows is composite and every partial sum (n>1) of the columns is prime. 1 3 5 6... 2 8 12 11... 4 18 20... 10 24... 14... Sequence contains the main diagonal. |
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5
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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 partial sum (n>1) of the rows is composite and every partial sum (n>1) of the columns is prime.
1 3 5 6...
2 8 12 11...
4 18 20
10 24...
14...
...
e.g. the third partial sum of the second row is 2+8+12=22 is composite while the same for the second column is 3+8+18 = 29 is prime.
Sequence contains the main diagonal.
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CROSSREFS
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Cf. A082224, A082225, A082226, A082227, A082228, A082229, A082230.
Adjacent sequences: A082228 A082229 A082230 this_sequence A082232 A082233 A082234
Sequence in context: A091560 A061877 A119284 this_sequence A029845 A124972 A000731
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KEYWORD
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more,nonn,bref
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 09 2003
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