Search: id:A143544
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%I A143544
%S A143544 1,2,2,2,2,2,1,1,1,1,2,2,2,2,2,1,1,1,1,1,1,2,2,2,2,2,2,2,1,1,1,1,1,1,1,
%T A143544 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2
%N A143544 Triangle read by rows, T(n,k) = 2 if n is prime, 1 otherwise; 1<=k<=n.
%C A143544 Row sums = A143545: (1, 4, 6, 4, 10, 6, 14,...) = componentwise addition 
               of (1, 2, 3, 4, 5,...) and A061397: (0, 2, 3, 0, 5, 0, 7,...).
%F A143544 Triangle read by rows, T(n,k) = 2 if n is prime, 1 otherwise; 1<=k<=n
%e A143544 First few rows of the triangle =
%e A143544 1;
%e A143544 2, 2;
%e A143544 2, 2, 2;
%e A143544 1, 1, 1, 1;
%e A143544 2, 2, 2, 2, 2;
%e A143544 1, 1, 1, 1, 1, 1;
%e A143544 2, 2, 2, 2, 2, 2, 2;
%e A143544 ...
%Y A143544 Cf. A061397, A143545.
%Y A143544 Sequence in context: A016016 A063059 A102675 this_sequence A031346 A087472 
               A054348
%Y A143544 Adjacent sequences: A143541 A143542 A143543 this_sequence A143545 A143546 
               A143547
%K A143544 nonn,tabl
%O A143544 1,2
%A A143544 Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 23 2008

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