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Search: id:A127641
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| 2, 3, 3, 5, 0, 5, 7, 7, 0, 7, 11, 0, 0, 0, 11, 13, 13, 13, 0, 0, 13, 17, 0, 0, 0, 0, 0, 17, 19, 19, 0, 19, 0, 0, 0, 19, 23, 0, 23, 0, 0, 0, 0, 0, 23, 29, 29, 0, 0, 29, 0, 0, 0, 0, 29, 31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31, 37, 37, 37, 37, 0, 37, 0, 0, 0, 0, 0, 37, 41, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 41
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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A prime transform of A051731.
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EXAMPLE
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First few rows of the triangle are:
2;
3, 3;
5, 0, 5;
7, 7, 0, 7;
11, 0, 0, 0, 11;
13, 13, 13, 0, 0, 13;
...
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MAPLE
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A127640 := proc(n, m) if m < n then 0; else ithprime(n) ; fi ; end: A051731 := proc(n, k) if n mod k = 0 then 1 ; else 0 ; fi ; end: A127641 := proc(n, m) add( A127640(n, k)*A051731(k, m), k=1..n) ; end: for n from 1 to 15 do for m from 1 to n do printf("%d, ", A127641(n, m)) ; od ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 19 2007
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CROSSREFS
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Cf. A127640, A051731, A127638, A127639.
Sequence in context: A111574 A128744 A118963 this_sequence A106821 A065863 A049272
Adjacent sequences: A127638 A127639 A127640 this_sequence A127642 A127643 A127644
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KEYWORD
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nonn,tabl,easy
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 21 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 19 2007
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