# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a362619 Showing 1-1 of 1 %I A362619 #7 May 11 2023 08:47:12 %S A362619 1,2,3,4,5,6,7,8,9,10,11,13,14,15,16,17,18,19,21,22,23,25,26,27,29,30, %T A362619 31,32,33,34,35,36,37,38,39,41,42,43,46,47,49,50,51,53,54,55,57,58,59, %U A362619 61,62,64,65,66,67,69,70,71,73,74,75,77,78,79,81,82,83 %N A362619 One and all numbers whose greatest prime factor is a mode, meaning it appears at least as many times as each of the others. %C A362619 First differs from A304678 in having 300. %H A362619 Wikipedia, Mode (statistics). %e A362619 The prime factorization of 300 is 2*2*3*5*5, with modes {2,5} and maximum 5, so 300 is in the sequence. %t A362619 prifacs[n_]:=If[n==1,{},Flatten[ConstantArray@@@FactorInteger[n]]]; %t A362619 Select[Range[100],MemberQ[Commonest[prifacs[#]],Max[prifacs[#]]&] %Y A362619 Partitions of this type are counted by A171979. %Y A362619 The case of a unique mode is A362616, counted by A362612. %Y A362619 The complement is A362620, counted by A240302. %Y A362619 A027746 lists prime factors, A112798 indices, length A001222, sum A056239. %Y A362619 A356862 ranks partitions with a unique mode, counted by A362608. %Y A362619 A359178 ranks partitions with a unique co-mode, counted by A362610. %Y A362619 A362605 ranks partitions with a more than one mode, counted by A362607. %Y A362619 A362606 ranks partitions with a more than one co-mode, counted by A362609. %Y A362619 A362611 counts modes in prime factorization, triangle version A362614. %Y A362619 A362613 counts co-modes in prime factorization, triangle version A362615. %Y A362619 A362621 ranks partitions with median equal to maximum, counted by A053263. %Y A362619 Cf. A000040, A002865, A237824, A237984, A327473, A327476, A359908. %K A362619 nonn %O A362619 1,2 %A A362619 _Gus Wiseman_, May 09 2023 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE