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Search: id:A082012
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| A082012 |
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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 a prime with the condition that the n-th diagonal sum is a multiple of n. 2 3 19 11 53... 5 13 17 43... 7 23 41... 29 37... 31... ... sequence contains the first row. |
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+0
5
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OFFSET
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1,1
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COMMENT
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The term a(2,2) is 13 and not 11 as 7 + 11 = 18 and no prime can be placed at a(3,1) to satisfy the requirement.
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CROSSREFS
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Cf. A082011, A082013, A082014, A082015.
Adjacent sequences: A082009 A082010 A082011 this_sequence A082013 A082014 A082015
Sequence in context: A073983 A139319 A092925 this_sequence A059675 A128353 A109418
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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 05 2003
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EXTENSIONS
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Needs editing - see A082002, A082003, A082004, A082005 for a model. - njas
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