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A324760 Heinz numbers of integer partitions not containing 1 or any part whose prime indices all belong to the partition. 8

%I #6 Mar 18 2019 08:14:32

%S 1,3,5,7,9,11,13,17,19,21,23,25,27,29,31,33,35,37,39,41,43,47,49,51,

%T 53,57,59,61,63,65,67,71,73,77,79,81,83,85,87,89,91,93,95,97,99,101,

%U 103,107,109,111,113,115,117,121,123,125,127,129,131,133,137,139

%N Heinz numbers of integer partitions not containing 1 or any part whose prime indices all belong to the partition.

%C A prime index of n is a number m such that prime(m) divides n. The multiset of prime indices of n is row n of A112798. 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 3: {2}

%e 5: {3}

%e 7: {4}

%e 9: {2,2}

%e 11: {5}

%e 13: {6}

%e 17: {7}

%e 19: {8}

%e 21: {2,4}

%e 23: {9}

%e 25: {3,3}

%e 27: {2,2,2}

%e 29: {10}

%e 31: {11}

%e 33: {2,5}

%e 35: {3,4}

%e 37: {12}

%e 39: {2,6}

%e 41: {13}

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

%t Select[Range[100],!MemberQ[primeMS[#],k_/;SubsetQ[primeMS[#],primeMS[k]]]&]

%Y The subset version is A324739, with maximal case A324762. The strict integer partition version is A324750. The integer partition version is A324755. An infinite version is A324694.

%Y Cf. A000720, A001221, A007097, A056239, A112798, A289509, A290822, A306844, A324695, A324696, A324737, A324744.

%K nonn

%O 1,2

%A _Gus Wiseman_, Mar 17 2019

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Last modified August 2 18:58 EDT 2024. Contains 374861 sequences. (Running on oeis4.)