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A278199 Partition numbers (A000041) of the form 2^5 * k for odd k. 7

%I #11 Nov 28 2016 08:11:43

%S 4087968,625846753120,576672674947168,1896564103591584,

%T 21424521360255636320,61382395164161775318496,

%U 25744258930034131533263392,54951205445179608281719072,1317709210896221493178043552,172557592110602218633091543840,6647848746214407376439536432805536

%N Partition numbers (A000041) of the form 2^5 * k for odd k.

%C Also partition numbers having five times as many even divisors as odd divisors.

%H Colin Barker, <a href="/A278199/b278199.txt">Table of n, a(n) for n = 1..300</a>

%t Select[PartitionsP@ Range@ 1200, Count[#, k_ /; EvenQ@ k] == 5 Count[#, k_ /; OddQ@ k] &@ Divisors@ # &] (* _Michael De Vlieger_, Nov 15 2016 *)

%o (PARI) maxk=1400; L=List(); for(k=1, maxk, p=numbpart(k); if(p%2^5==0 & p\2^5%2==1, listput(L, p))); Vec(L)

%Y Cf. A275029, A278196, A278197, A278198, A278200, A278201.

%K nonn

%O 1,1

%A _Colin Barker_, Nov 15 2016

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Last modified September 3 02:34 EDT 2024. Contains 375649 sequences. (Running on oeis4.)