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Search: id:A161535
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| A161535 |
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Array read by antidiagonals: Row n contains those positive multiples of the first n primes. |
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1
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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
(list; table; graph; listen)
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OFFSET
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1,1
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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,...
Contribution from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 04 2009: (Start)
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: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 04 2009]
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CROSSREFS
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Sequence in context: A046820 A043262 A130860 this_sequence A138785 A131817 A138232
Adjacent sequences: A161532 A161533 A161534 this_sequence A161536 A161537 A161538
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KEYWORD
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nonn,tabl
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jun 13 2009
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 04 2009
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