Search: id:A073060
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%I A073060
%S A073060 1,3,3,5,9,5,7,15,15,7,11,21,25,21,11,13,33,35,35,33,13,17,39,55,49,55,
%T A073060 39,17,19,51,65,77,77,65,51,19,23,57,85,91,121,91,85,57,23,29,69,95,119,
%U A073060 143,143,119,95,69,29,31,87,115,133,187,169,187,133,115,87,31,37,93,145
%N A073060 Multiplication table for 1 and odd primes, read by antidiagonals.
%C A073060 Entries in table are sometimes called semiprimes or biprimes (see A001358).
%e A073060 Table begins
%e A073060 1 3 5 7 11 13 ...
%e A073060 3 9 15 21 33 ...
%e A073060 5 15 25 35 ...
%p A073060 a[1] := 1:for j from 2 to 100 do a[j] := ithprime(j):od:s := 0:for j 
               from 1 to 16 do for i from 1 to j do s := s+1:b[s] := a[j-i+1]*a[i]; 
               od:od:seq(b[q],q=1..s);
%Y A073060 Sequence in context: A039872 A079965 A098353 this_sequence A087343 A079586 
               A125960
%Y A073060 Adjacent sequences: A073057 A073058 A073059 this_sequence A073061 A073062 
               A073063
%K A073060 nonn,tabl,easy
%O A073060 0,2
%A A073060 Stuart M. Ellerstein (ellerstein(AT)aol.com), Aug 16 2002
%E A073060 Corrected and extended by Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), 
               Jan 28 2003

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