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!)
A316893 Number of aperiodic integer partitions of n into relatively prime parts whose reciprocal sum is 1. 1

%I #8 Jul 16 2018 21:47:30

%S 1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,2,0,0,0,0,0,1,3,1,2,1,1,1,

%T 2,1,5,3,1,1,5,2,9,3,3,3,4,2,6,6,3,4,9,5,10,4,10,8,15,10,21,12,14,16,

%U 18,9,30,18,17,16,28,16,29,25,26,30,28,33,48,31

%N Number of aperiodic integer partitions of n into relatively prime parts whose reciprocal sum is 1.

%C The reciprocal sum of (y_1, ..., y_k) is 1/y_1 + ... + 1/y_k.

%C A partition is aperiodic if its multiplicities are relatively prime.

%H Gus Wiseman, <a href="/A051908/a051908.txt">Sequences counting and ranking integer partitions by their reciprocal sums</a>

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

%Y Cf. A000837, A002966, A051908, A058360, A100953, A316854, A316888-A316904.

%K nonn

%O 1,22

%A _Gus Wiseman_, Jul 16 2018

%E a(71)-a(80) from _Giovanni Resta_, Jul 16 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 April 24 04:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)