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A098350
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Multiplication table of the primes read by antidiagonals.
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18
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4, 6, 6, 10, 9, 10, 14, 15, 15, 14, 22, 21, 25, 21, 22, 26, 33, 35, 35, 33, 26, 34, 39, 55, 49, 55, 39, 34, 38, 51, 65, 77, 77, 65, 51, 38, 46, 57, 85, 91, 121, 91, 85, 57, 46, 58, 69, 95, 119, 143, 143, 119, 95, 69, 58, 62, 87, 115, 133, 187, 169, 187, 133, 115, 87, 62
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OFFSET
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1,1
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COMMENTS
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Contains only semiprimes (A001358).
sum{n>=1, k>=1} 1/T(n,k)^s = P(s)^2, where P is the Prime Zeta Function. - Enrique Pérez Herrero, Jun 24 2012
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LINKS
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FORMULA
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T(n,k) = A003991(prime(n),prime(k)).
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EXAMPLE
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4, 6, 10, 14, 22, 26, 34, 38, 46, 58,...
6, 9, 15, 21, 33, 39, 51, 57, 69, 87,...
10, 15, 25, 35, 55, 65, 85, 95,115,145,...
14, 21, 35, 49, 77, 91,119,133,161,203,...
22, 33, 55, 77,121,143,187,209,253,319,...
26, 39, 65, 91,143,169,221,247,299,377,...
34, 51, 85,119,187,221,289,323,391,493,...
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CROSSREFS
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KEYWORD
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AUTHOR
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Douglas Stones (dssto1(AT)student.monash.edu.au), Sep 04 2004
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STATUS
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approved
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