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A328171 Number of (necessarily strict) integer partitions of n with no two consecutive parts divisible. 33

%I #13 Jan 10 2021 08:54:44

%S 1,1,1,1,1,2,1,3,2,4,4,5,4,9,9,10,12,14,16,20,23,29,34,38,41,51,60,66,

%T 78,89,103,119,137,157,180,201,229,261,298,338,379,431,486,547,618,

%U 694,783,876,986,1103,1241,1387,1551,1728,1932,2148,2395,2664,2963

%N Number of (necessarily strict) integer partitions of n with no two consecutive parts divisible.

%H Fausto A. C. Cariboni, <a href="/A328171/b328171.txt">Table of n, a(n) for n = 0..330</a>

%e The a(1) = 1 through a(15) = 10 partitions (A..F = 10..15):

%e 1 2 3 4 5 6 7 8 9 A B C D E F

%e 32 43 53 54 64 65 75 76 86 87

%e 52 72 73 74 543 85 95 96

%e 432 532 83 732 94 A4 B4

%e 92 A3 B3 D2

%e B2 653 654

%e 643 743 753

%e 652 752 852

%e 832 5432 A32

%e 6432

%t Table[Length[Select[IntegerPartitions[n],!MatchQ[#,{___,x_,y_,___}/;Divisible[x,y]]&]],{n,0,30}]

%Y The complement is counted by A328221.

%Y The Heinz numbers of these partitions are A328603.

%Y Partitions whose pairs of consecutive parts are relatively prime are A328172, with strict case A328188.

%Y Partitions with no pair of consecutive parts relatively prime are A328187, with strict case A328220.

%Y Numbers without consecutive divisible proper divisors are A328028.

%Y Cf. A000837, A018783, A328026, A328161, A328189, A328194, A328195.

%K nonn

%O 0,6

%A _Gus Wiseman_, Oct 11 2019

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Last modified April 24 03:08 EDT 2024. Contains 371918 sequences. (Running on oeis4.)