This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A340653 #14 Oct 22 2023 15:13:38 %S A340653 1,1,1,0,1,0,1,1,0,0,1,2,1,0,0,1,1,2,1,2,0,0,1,1,0,0,1,2,1,3,1,1,0,0, %T A340653 0,2,1,0,0,1,1,3,1,2,2,0,1,2,0,2,0,2,1,1,0,1,0,0,1,2,1,0,2,1,0,3,1,2, %U A340653 0,3,1,3,1,0,2,2,0,3,1,2,1,0,1,2,0,0,0,1,1,2,0,2,0,0,0,3,1,2,2,2,1,3,1,1,3,0,1,3,1,3,0,2,1,3,0,2,2,0,0,4 %N A340653 Number of balanced factorizations of n. %C A340653 A factorization into factors > 1 is balanced if it is empty or its length is equal to its maximum Omega (A001222). %H A340653 Antti Karttunen, <a href="/A340653/b340653.txt">Table of n, a(n) for n = 1..65537</a> %H A340653 <a href="/index/Eu#epf">Index entries for sequences computed from exponents in factorization of n</a> %e A340653 The balanced factorizations for n = 120, 144, 192, 288, 432, 768: %e A340653 3*5*8 2*8*9 3*8*8 4*8*9 6*8*9 8*8*12 %e A340653 2*2*30 3*6*8 4*6*8 6*6*8 2*8*27 2*2*8*24 %e A340653 2*3*20 2*4*18 2*8*12 2*8*18 3*8*18 2*3*8*16 %e A340653 2*5*12 2*6*12 4*4*12 3*8*12 4*4*27 2*4*4*24 %e A340653 3*4*12 2*2*2*24 4*4*18 4*6*18 2*4*6*16 %e A340653 2*2*3*16 4*6*12 4*9*12 3*4*4*16 %e A340653 2*12*12 6*6*12 2*2*12*16 %e A340653 2*2*2*36 2*12*18 2*2*2*2*48 %e A340653 2*2*3*24 3*12*12 2*2*2*3*32 %e A340653 2*3*3*16 2*2*2*54 %e A340653 2*2*3*36 %e A340653 2*3*3*24 %e A340653 3*3*3*16 %t A340653 facs[n_]:=If[n<=1,{{}},Join@@Table[Map[Prepend[#,d]&,Select[facs[n/d],Min@@#>=d&]],{d,Rest[Divisors[n]]}]]; %t A340653 Table[Length[Select[facs[n],#=={}||Length[#]==Max[PrimeOmega/@#]&]],{n,100}] %o A340653 (PARI) A340653(n, m=n, mbo=0, e=0) = if(1==n, mbo==e, sumdiv(n, d, if((d>1)&&(d<=m), A340653(n/d, d, max(mbo,bigomega(d)), 1+e)))); \\ _Antti Karttunen_, Oct 22 2023 %Y A340653 Positions of zeros are A001358. %Y A340653 Positions of nonzero terms are A100959. %Y A340653 The co-balanced version is A340596. %Y A340653 Taking maximum factor instead of maximum Omega gives A340599. %Y A340653 The cross-balanced version is A340654. %Y A340653 The twice-balanced version is A340655. %Y A340653 A001055 counts factorizations. %Y A340653 A045778 counts strict factorizations. %Y A340653 A316439 counts factorizations by product and length. %Y A340653 A320655 counts factorizations into semiprimes. %Y A340653 Other balance-related sequences: %Y A340653 - A010054 counts balanced strict partitions. %Y A340653 - A047993 counts balanced partitions. %Y A340653 - A098124 counts balanced compositions. %Y A340653 - A106529 lists Heinz numbers of balanced partitions. %Y A340653 - A340597 have an alt-balanced factorization. %Y A340653 - A340598 counts balanced set partitions. %Y A340653 - A340600 counts unlabeled balanced multiset partitions. %Y A340653 - A340656 have no twice-balanced factorizations. %Y A340653 - A340657 have a twice-balanced factorization. %Y A340653 Cf. A003963, A117409, A303975, A320656, A339846, A339890, A340608. %K A340653 nonn %O A340653 1,12 %A A340653 _Gus Wiseman_, Jan 15 2021 %E A340653 Data section extended up to a(120) by _Antti Karttunen_, Oct 22 2023