A198292 - OEIS

%I #10 Sep 08 2022 08:45:59

%S 2,3,4,5,5,6,7,7,8,8,9,9,10,10,11,11,11,12,12,12,13,13,13,14,14,15,15,

%T 15,16,16,17,17,17,17,18,18,18,18,19,19,20,20,20,21,21,21,21,22,22,22,

%U 23,23,23,23,24,24,24,24,24,25,25,25,25,26,26,26,27,27,27,27,27,28,28,28

%N Irregular triangle with row n being A045917(n) copies of n.

%H Jason Kimberley, <a href="/A198292/b198292.txt">Table of i, a(i)=T(n,k)=n for n = 2..200 (i = 2..1794)</a>

%e Triangle begins:

%e 2;

%e 3;

%e 4;

%e 5, 5;

%e 6;

%e 7, 7;

%e 8, 8;

%e 9, 9;

%e 10, 10;

%e 11, 11, 11;

%o (Magma)

%o A182138:=func<n|[n-p:p in PrimesUpTo(n)|IsPrime(2*n-p)]>;

%o A045917:=func<n|#A182138(n)>;

%o A198292:=func<n|[n^^A045917(n)]>;

%o &cat[A198292(n):n in[1..29]];

%Y This triangle has the same dimensions as both A182138 and A184995.

%K easy,nonn,tabf

%O 2,1

%A _Jason Kimberley_, Oct 03 2012