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%I #11 Nov 01 2021 00:43:26
%S 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,
%T 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2
%N Triangle read by rows, T(n,k) = 2 if n is prime, 1 otherwise; 1<=k<=n.
%C 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,...).
%H Michael De Vlieger, <a href="/A143544/b143544.txt">Table of n, a(n) for n = 1..11325</a>
%F Triangle read by rows, T(n,k) = 2 if n is prime, 1 otherwise; 1<=k<=n.
%F T(n, k) = A143536(n, k) + 1. - _Georg Fischer_, Oct 31 2021
%e First few rows of the triangle =
%e 1;
%e 2, 2;
%e 2, 2, 2;
%e 1, 1, 1, 1;
%e 2, 2, 2, 2, 2;
%e 1, 1, 1, 1, 1, 1;
%e 2, 2, 2, 2, 2, 2, 2;
%e ...
%t Table[1 + Boole[PrimeQ[n]], {n, 11}, {k, n}] // Flatten (* _Michael De Vlieger_, Oct 31 2021 *)
%Y Cf. A010051, A061397, A143536, A143545.
%K nonn,tabl
%O 1,2
%A _Gary W. Adamson_, Aug 23 2008
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