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A321649 Irregular triangle whose n-th row is the conjugate of the integer partition with Heinz number n. 16

%I #8 Nov 15 2018 21:12:02

%S 1,1,1,2,1,1,1,2,1,1,1,1,1,3,2,2,2,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,2,1,

%T 1,1,2,2,1,4,1,1,1,1,1,1,1,3,2,1,1,1,1,1,1,1,1,3,1,1,2,2,1,1,2,1,1,1,

%U 1,1,1,1,1,1,1,1,1,1,4,1,2,2,2,2,1,1,1

%N Irregular triangle whose n-th row is the conjugate of the integer partition with Heinz number n.

%C The Heinz number of an integer partition (y_1, ..., y_k) is prime(y_1) * ... * prime(y_k).

%F a(n,i) = A296150(A122111(n),i).

%e Triangle begins:

%e 1

%e 1 1

%e 2

%e 1 1 1

%e 2 1

%e 1 1 1 1

%e 3

%e 2 2

%e 2 1 1

%e 1 1 1 1 1

%e 3 1

%e 1 1 1 1 1 1

%e 2 1 1 1

%e 2 2 1

%e 4

%e 1 1 1 1 1 1 1

%e 3 2

%e 1 1 1 1 1 1 1 1

%e 3 1 1

%e 2 2 1 1

%e 2 1 1 1 1

%e 1 1 1 1 1 1 1 1 1

%e The sequence of dual partitions begins: (), (1), (11), (2), (111), (21), (1111), (3), (22), (211), (11111), (31), (111111), (2111), (221), (4), (1111111), (32), (11111111), (311), (2211), (21111), (111111111), (41), (222), (211111), (33), (3111), (1111111111), (321).

%t primeMS[n_]:=If[n==1,{},Flatten[Cases[FactorInteger[n],{p_,k_}:>Table[PrimePi[p],{k}]]]];

%t conj[y_]:=If[Length[y]==0,y,Table[Length[Select[y,#>=k&]],{k,1,Max[y]}]];

%t Table[conj[primeMS[n]],{n,30}]

%Y Cf. A008480, A056239, A112798, A122111, A296150, A321648, A321650.

%K nonn,tabf

%O 1,4

%A _Gus Wiseman_, Nov 15 2018

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Last modified August 28 08:02 EDT 2024. Contains 375477 sequences. (Running on oeis4.)