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A328676 Number of relatively prime integer partitions of n whose distinct parts are pairwise indivisible. 4

%I #6 Nov 01 2019 18:41:23

%S 1,1,1,1,2,1,4,3,5,5,11,7,16,14,18,22,34,30,47,45,59,66,89,90,118,125,

%T 159,169,218,225,289,304,369,400,486,520,636,680,806,873,1051,1105,

%U 1333,1424,1664,1803,2122,2253,2659,2841,3283,3560,4118,4388,5096

%N Number of relatively prime integer partitions of n whose distinct parts are pairwise indivisible.

%e The a(4) = 1 through a(11) = 11 partitions:

%e 1111 32 111111 43 53 54 73 65

%e 11111 52 332 72 433 74

%e 322 11111111 522 532 83

%e 1111111 3222 3322 92

%e 111111111 1111111111 443

%e 533

%e 722

%e 3332

%e 5222

%e 32222

%e 11111111111

%t stableQ[u_,Q_]:=!Apply[Or,Outer[#1=!=#2&&Q[#1,#2]&,u,u,1],{0,1}];

%t Table[Length[Select[IntegerPartitions[n],GCD@@#==1&&stableQ[#,Divisible]&]],{n,30}]

%Y The Heinz numbers of these partitions are given by A328677.

%Y The strict case is A328678.

%Y The binary index version is A328671.

%Y Relatively prime partitions are A000837.

%Y Partitions whose distinct parts are pairwise indivisible are A305148.

%Y Cf. A285573, A289509, A303362, A316476, A326912, A327393, A328171.

%K nonn

%O 1,5

%A _Gus Wiseman_, Oct 29 2019

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Last modified April 24 02:28 EDT 2024. Contains 371917 sequences. (Running on oeis4.)