A053248 - cp's OEIS frontend

A053248 Second differences of sigma(n) that are negative.

n	a(n)
1	1
2	4
3	10
4	9
5	11
6	30
7	10
8	20
9	40
10	32
11	16
12	65
13	13
14	42
15	82
16	46
17	12
18	96
19	26
20	82
21	106
22	46
23	18
24	143
25	57
26	70
27	114
28	88
29	40
30	214
31	26
32	66
33	136
34	88
35	120
36	244
37	30
38	60
39	160
40	171
41	47
42	256
43	36
44	150
45	266
46	96
47	40
48	286
49	88
50	176
51	226
52	124
53	12
54	24
55	342
56	170
57	230
58	222
59	94
60	34
61	443
62	71

[1, 4, 10, 9, 11, 30, 10, 20, 40, 32, 16, 65, 13, 42, 82, 46, 12, 96, 26, 82, 106, 46, 18, 143, 57, 70, 114, 88, 40, 214, 26, 66, 136, 88, 120, 244, 30, 60, 160, 171, 47, 256, 36, 150, 266, 96, 40, 286, 88, 176, 226, 124, 12, 24, 342, 170, 230, 222, 94, 34, 443, 71]

cp's OEIS Frontend

A053248 Second differences of sigma(n) that are negative.

Table of values

List of values

n	a(n)
1	1
2	4
3	10
4	9
5	11
6	30
7	10
8	20
9	40
10	32
11	16
12	65
13	13
14	42
15	82
16	46
17	12
18	96
19	26
20	82
21	106
22	46
23	18
24	143
25	57
26	70
27	114
28	88
29	40
30	214
31	26
32	66
33	136
34	88
35	120
36	244
37	30
38	60
39	160
40	171
41	47
42	256
43	36
44	150
45	266
46	96
47	40
48	286
49	88
50	176
51	226
52	124
53	12
54	24
55	342
56	170
57	230
58	222
59	94
60	34
61	443
62	71

n	a(n)
1	1
2	4
3	10
4	9
5	11
6	30
7	10
8	20
9	40
10	32
11	16
12	65
13	13
14	42
15	82
16	46
17	12
18	96
19	26
20	82
21	106
22	46
23	18
24	143
25	57
26	70
27	114
28	88
29	40
30	214
31	26
32	66
33	136
34	88
35	120
36	244
37	30
38	60
39	160
40	171
41	47
42	256
43	36
44	150
45	266
46	96
47	40
48	286
49	88
50	176
51	226
52	124
53	12
54	24
55	342
56	170
57	230
58	222
59	94
60	34
61	443
62	71

n	a(n)
1	1
2	4
3	10
4	9
5	11
6	30
7	10
8	20
9	40
10	32
11	16
12	65
13	13
14	42
15	82
16	46
17	12
18	96
19	26
20	82
21	106
22	46
23	18
24	143
25	57
26	70
27	114
28	88
29	40
30	214
31	26
32	66
33	136
34	88
35	120
36	244
37	30
38	60
39	160
40	171
41	47
42	256
43	36
44	150
45	266
46	96
47	40
48	286
49	88
50	176
51	226
52	124
53	12
54	24
55	342
56	170
57	230
58	222
59	94
60	34
61	443
62	71