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A161535
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Array read by antidiagonals: Row n contains the positive multiples of the first n primes.
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0
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2, 2, 4, 2, 3, 6, 2, 3, 4, 8, 2, 3, 4, 6, 10, 2, 3, 4, 5, 8, 12, 2, 3, 4, 5, 6, 9, 14, 2, 3, 4, 5, 6, 8, 10, 16, 2, 3, 4, 5, 6, 7, 9, 12, 18, 2, 3, 4, 5, 6, 7, 8, 10, 14, 20, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15, 22, 2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 16, 24, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 26, 2, 3, 4, 5
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Row 2 consists of the positive multiples of the first 2 primes (2 and 3). 2,3,4,6,8,9,10,12,14,15,16,18,20,...
The table starts
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
2 3 4 6 8 9 10 12 14 15 16 18 20 21 22 24 26 27 28 30
2 3 4 5 6 8 9 10 12 14 15 16 18 20 21 22 24 25 26 27
2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 22 24 25 26
2 3 4 5 6 7 8 9 10 11 12 14 15 16 18 20 21 22 24 25
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 20 21 22 24
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 21 22
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
(End)
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MAPLE
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T := proc(n, k) option remember; local i, a; if k = 1 then 2; else for a from procname(n, k-1) +1 do for i from 1 to n do if a mod ithprime(i) =0 then RETURN(a); fi; od: od: fi; end: for d from 1 to 15 do for k from 1 to d do printf("%d, ", T(d-k+1, k)) ; od: od: # R. J. Mathar, Jul 04 2009
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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