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A356067 Number of integer partitions of n into relatively prime prime-powers. 1

%I #6 Jul 29 2022 09:51:27

%S 0,0,0,0,0,1,0,3,2,5,4,11,7,18,16,26,27,43,41,65,65,92,100,137,142,

%T 194,210,270,295,379,410,519,571,699,782,947,1046,1267,1414,1673,1870,

%U 2213,2465,2897,3230,3757,4210,4871,5427,6265,6997

%N Number of integer partitions of n into relatively prime prime-powers.

%e The a(5) = 1 through a(12) = 7 partitions:

%e (32) . (43) (53) (54) (73) (74) (75)

%e (52) (332) (72) (433) (83) (543)

%e (322) (432) (532) (92) (552)

%e (522) (3322) (443) (732)

%e (3222) (533) (4332)

%e (542) (5322)

%e (722) (33222)

%e (3332)

%e (4322)

%e (5222)

%e (32222)

%t Table[Length[Select[IntegerPartitions[n],And@@PrimePowerQ/@#&&GCD@@#==1&]],{n,0,30}]

%Y This is the relatively prime case of A023894, facs A000688, w/ 1's A023893.

%Y For strict instead of coprime: A054685, facs A050361, with 1's A106244.

%Y The version for factorizations instead of partitions is A354911.

%Y A000041 counts partitions, strict A000009.

%Y A072233 counts partitions by sum and length.

%Y A246655 lists the prime-powers (A000961 includes 1), towers A164336.

%Y A279784 counts twice-partitions where the latter partitions are constant.

%Y A289509 lists numbers whose prime indices are relatively prime.

%Y A355743 lists numbers with prime-power prime indices, squarefree A356065.

%Y Cf. A001970, A055887, A063834, A076610, A085970, A355737, A355742.

%K nonn

%O 0,8

%A _Gus Wiseman_, Jul 28 2022

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Last modified May 11 01:12 EDT 2024. Contains 372388 sequences. (Running on oeis4.)