

A098350


Multiplication table of the primes read by antidiagonals.


2



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

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



