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A327476 Heinz numbers of integer partitions whose mean A326567/A326568 is not a part. 52

%I #4 Sep 13 2019 17:04:49

%S 1,6,10,12,14,15,18,20,21,22,24,26,28,33,34,35,36,38,39,40,42,44,45,

%T 46,48,50,51,52,54,55,56,57,58,60,62,63,65,66,68,69,70,72,74,75,76,77,

%U 78,80,82,85,86,87,88,91,92,93,94,95,96,98,99,100,102,104,106

%N Heinz numbers of integer partitions whose mean A326567/A326568 is not a part.

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

%e The sequence of terms together with their prime indices begins:

%e 1: {}

%e 6: {1,2}

%e 10: {1,3}

%e 12: {1,1,2}

%e 14: {1,4}

%e 15: {2,3}

%e 18: {1,2,2}

%e 20: {1,1,3}

%e 21: {2,4}

%e 22: {1,5}

%e 24: {1,1,1,2}

%e 26: {1,6}

%e 28: {1,1,4}

%e 33: {2,5}

%e 34: {1,7}

%e 35: {3,4}

%e 36: {1,1,2,2}

%e 38: {1,8}

%e 39: {2,6}

%e 40: {1,1,1,3}

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

%t Select[Range[100],!MemberQ[primeMS[#],Mean[primeMS[#]]]&]

%Y Complement of A327473.

%Y The enumeration of these partitions by sum is given by A327472.

%Y Subsets whose mean is not an element are A327471.

%Y Cf. A056239, A067538, A112798, A114639, A237984, A240851, A316413, A324756, A324758, A326567/A326568, A327477.

%K nonn

%O 1,2

%A _Gus Wiseman_, Sep 13 2019

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Last modified August 23 04:29 EDT 2024. Contains 375375 sequences. (Running on oeis4.)