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 A098350 Multiplication table of the primes read by antidiagonals. 18
 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 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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 LINKS Table of n, a(n) for n=1..66. FORMULA T(n,k) = A003991(prime(n),prime(k)). T(n,k) = T(k,n) = A087112(n,k). EXAMPLE 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,... CROSSREFS Cf. A098351, A006881. Sequence in context: A215454 A155750 A159475 * A276269 A163173 A058640 Adjacent sequences: A098347 A098348 A098349 * A098351 A098352 A098353 KEYWORD nonn,tabl AUTHOR Douglas Stones (dssto1(AT)student.monash.edu.au), Sep 04 2004 STATUS approved

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Last modified November 30 19:52 EST 2023. Contains 367462 sequences. (Running on oeis4.)