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A114324 Number of partitions of n with a product greater than n. 9

%I #16 Oct 16 2020 10:01:25

%S 1,0,0,0,0,1,3,6,10,16,26,39,56,79,111,150,200,265,349,453,586,749,

%T 957,1209,1522,1903,2379,2950,3654,4500,5534,6771,8271,10063,12228,

%U 14799,17884,21543,25919,31087,37233,44477,53063,63149,75059,89014,105436,124631

%N Number of partitions of n with a product greater than n.

%C The Heinz numbers of these partitions are given by A325037. - _Gus Wiseman_, Mar 27 2019

%H Alois P. Heinz, <a href="/A114324/b114324.txt">Table of n, a(n) for n = 0..1000</a>

%H Pankaj Jyoti Mahanta, <a href="https://arxiv.org/abs/2010.07353">On the number of partitions of n whose product of the summands is at most n</a>, arXiv:2010.07353 [math.CO], 2020.

%e a(6) = 3 since there are 3 partitions of 6 with product greater than 6: {3,3}, {2,2,2}, {4,2}.

%e From _Gus Wiseman_, Mar 27 2019: (Start)

%e The a(5) = 1 through a(9) = 16 partitions:

%e (32) (33) (43) (44) (54)

%e (42) (52) (53) (63)

%e (222) (322) (62) (72)

%e (331) (332) (333)

%e (421) (422) (432)

%e (2221) (431) (441)

%e (521) (522)

%e (2222) (531)

%e (3221) (621)

%e (3311) (3222)

%e (3321)

%e (4221)

%e (4311)

%e (5211)

%e (22221)

%e (32211)

%e (End)

%t << DiscreteMath`Combinatorica`; lst=Table[Length@Select[Partitions[n], (Times @@ # > n) &],{n,50}]

%t Table[Length[Select[IntegerPartitions[n],Times@@#>n&]],{n,0,20}] (* _Gus Wiseman_, Mar 27 2019 *)

%Y Cf. A001055, A028422, A096276, A114324, A301987, A319000, A319005, A319916, A325037, A325038, A325044.

%K nonn

%O 0,7

%A _Giovanni Resta_, Feb 06 2006

%E a(0) = 1 prepended by _Gus Wiseman_, Mar 27 2019

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Last modified April 19 07:25 EDT 2024. Contains 371782 sequences. (Running on oeis4.)