A163831 - cp's OEIS frontend

A163831 a(n) is the n-th composite minus the sum of the indices of the primes in its prime factorization.

n	a(n)
1	2
2	3
3	5
4	5
5	6
6	8
7	9
8	10
9	12
10	13
11	15
12	15
13	16
14	19
15	19
16	19
17	21
18	22
19	24
20	27
21	26
22	26
23	28
24	30
25	29
26	31
27	34
28	35
29	37
30	38
31	36
32	42
33	41
34	43
35	42
36	44
37	47
38	47
39	49
40	47
41	47
42	53
43	50
44	55
45	58
46	56
47	58
48	59
49	58
50	62
51	65
52	61
53	67
54	66
55	68
56	69
57	73
58	73
59	68
60	76
61	75
62	71
63	75
64	80
65	82
66	81
67	81
68	80
69	78
70	84
71	89
72	89
73	90
74	92

[2, 3, 5, 5, 6, 8, 9, 10, 12, 13, 15, 15, 16, 19, 19, 19, 21, 22, 24, 27, 26, 26, 28, 30, 29, 31, 34, 35, 37, 38, 36, 42, 41, 43, 42, 44, 47, 47, 49, 47, 47, 53, 50, 55, 58, 56, 58, 59, 58, 62, 65, 61, 67, 66, 68, 69, 73, 73, 68, 76, 75, 71, 75, 80, 82, 81, 81, 80, 78, 84, 89, 89, 90, 92]

cp's OEIS Frontend

A163831 a(n) is the n-th composite minus the sum of the indices of the primes in its prime factorization.

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	5
5	6
6	8
7	9
8	10
9	12
10	13
11	15
12	15
13	16
14	19
15	19
16	19
17	21
18	22
19	24
20	27
21	26
22	26
23	28
24	30
25	29
26	31
27	34
28	35
29	37
30	38
31	36
32	42
33	41
34	43
35	42
36	44
37	47
38	47
39	49
40	47
41	47
42	53
43	50
44	55
45	58
46	56
47	58
48	59
49	58
50	62
51	65
52	61
53	67
54	66
55	68
56	69
57	73
58	73
59	68
60	76
61	75
62	71
63	75
64	80
65	82
66	81
67	81
68	80
69	78
70	84
71	89
72	89
73	90
74	92

n	a(n)
1	2
2	3
3	5
4	5
5	6
6	8
7	9
8	10
9	12
10	13
11	15
12	15
13	16
14	19
15	19
16	19
17	21
18	22
19	24
20	27
21	26
22	26
23	28
24	30
25	29
26	31
27	34
28	35
29	37
30	38
31	36
32	42
33	41
34	43
35	42
36	44
37	47
38	47
39	49
40	47
41	47
42	53
43	50
44	55
45	58
46	56
47	58
48	59
49	58
50	62
51	65
52	61
53	67
54	66
55	68
56	69
57	73
58	73
59	68
60	76
61	75
62	71
63	75
64	80
65	82
66	81
67	81
68	80
69	78
70	84
71	89
72	89
73	90
74	92

n	a(n)
1	2
2	3
3	5
4	5
5	6
6	8
7	9
8	10
9	12
10	13
11	15
12	15
13	16
14	19
15	19
16	19
17	21
18	22
19	24
20	27
21	26
22	26
23	28
24	30
25	29
26	31
27	34
28	35
29	37
30	38
31	36
32	42
33	41
34	43
35	42
36	44
37	47
38	47
39	49
40	47
41	47
42	53
43	50
44	55
45	58
46	56
47	58
48	59
49	58
50	62
51	65
52	61
53	67
54	66
55	68
56	69
57	73
58	73
59	68
60	76
61	75
62	71
63	75
64	80
65	82
66	81
67	81
68	80
69	78
70	84
71	89
72	89
73	90
74	92