A279609 - cp's OEIS frontend

A279609 a(n) = floor(H(k) + exp(H(k))*log(H(k))) - sigma(k) where H(k) is the k-th harmonic number Sum_{j=1..k} 1/j and k is the n-th colossally abundant number A004490(n).

n	a(n)
2	0
3	0
4	0
5	2
6	6
7	34
8	207
9	492
10	9051
11	143828
12	306310
13	963859
14	5155084
15	81053635
16	1334916490
17	29106956400
18	58655156200
19	1817551636000
20	56466287472000
21	376943525488000
22	1144451930851200
23	41803526752345600

[0, 0, 0, 2, 6, 34, 207, 492, 9051, 143828, 306310, 963859, 5155084, 81053635, 1334916490, 29106956400, 58655156200, 1817551636000, 56466287472000, 376943525488000, 1144451930851200, 41803526752345600]

cp's OEIS Frontend

A279609 a(n) = floor(H(k) + exp(H(k))*log(H(k))) - sigma(k) where H(k) is the k-th harmonic number Sum_{j=1..k} 1/j and k is the n-th colossally abundant number A004490(n).

Table of values

List of values