A379501 - cp's OEIS frontend

A379501 a(n) = (3/2)*A019565((2n-1)^2) - A019565(A001065((2n-1)^2)), where A019565 is the base-2 exp-function, and A001065 is the sum of proper divisors of n.

n	a(n)
1	2
2	16
3	216
4	422
5	470
6	51016
7	5082
8	4446
9	864
10	106688
11	1301846
12	880
13	204182
14	1985872
15	236964
16	646310
17	1030
18	176778
19	2799756
20	96178962
21	563400
22	62092576
23	1566805968
24	27274
25	559406
26	-16252236
27	1040774592
28	263042394
29	7794826
30	115781204
31	13256922
32	-16386856
33	-1230440
34	376172
35	-67188814
36	222905278
37	13547232
38	28352541646

[2, 16, 216, 422, 470, 51016, 5082, 4446, 864, 106688, 1301846, 880, 204182, 1985872, 236964, 646310, 1030, 176778, 2799756, 96178962, 563400, 62092576, 1566805968, 27274, 559406, -16252236, 1040774592, 263042394, 7794826, 115781204, 13256922, -16386856, -1230440, 376172, -67188814, 222905278, 13547232, 28352541646]

cp's OEIS Frontend

A379501 a(n) = (3/2)*A019565((2n-1)^2) - A019565(A001065((2n-1)^2)), where A019565 is the base-2 exp-function, and A001065 is the sum of proper divisors of n.

Table of values

List of values