The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A317493 Heinz numbers of integer partitions that are not fully normal. 3

%I #7 Jul 30 2018 22:16:15

%S 9,24,25,27,36,40,48,49,54,56,72,80,81,88,96,100,104,108,112,120,121,

%T 125,135,136,144,152,160,162,168,169,176,184,189,192,196,200,208,216,

%U 224,225,232,240,243,248,250,264,270,272,280,288,289,296,297,304,312

%N Heinz numbers of integer partitions that are not fully normal.

%C An integer partition is fully normal if either it is of the form (1,1,...,1) or its multiplicities span an initial interval of positive integers and, sorted in weakly decreasing order, are themselves fully normal.

%e Sequence of all integer partitions that are not fully normal begins: (22), (2111), (33), (222), (2211), (3111), (21111), (44), (2221), (4111), (22111), (31111), (2222), (5111), (211111), (3311).

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

%t fulnrmQ[ptn_]:=With[{qtn=Sort[Length/@Split[ptn],Greater]},Or[ptn=={}||Union[ptn]=={1},And[Union[qtn]==Range[Max[qtn]],fulnrmQ[qtn]]]];

%t Select[Range[100],!fulnrmQ[Reverse[primeMS[#]]]&]

%Y Cf. A055932, A056239, A181819, A182850, A296150, A305733, A317089, A317090, A317245, A317246, A317491, A317492.

%K nonn

%O 1,1

%A _Gus Wiseman_, Jul 30 2018

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 16 08:15 EDT 2024. Contains 372549 sequences. (Running on oeis4.)