A098350 Multiplication table of the primes read by antidiagonals.

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

Offset: 1

Author

Douglas Stones (dssto1(AT)student.monash.edu.au), Sep 04 2004

Keywords

• nonn
• tabl

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

Examples

			 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.

Formula

T(n,k) = A003991(prime(n),prime(k)).

T(n,k) = T(k,n) = A087112(n,k).