A023588 - cp's OEIS frontend

A023588 a(n) = sum of exponents in prime-power factorization of 2*prime(n)-1.

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	3
10	2
11	1
12	1
13	4
14	2
15	2
16	3
17	3
18	2
19	2
20	2
21	2
22	1
23	3
24	2
25	1
26	2
27	2
28	2
29	2
30	4
31	2
32	3
33	3
34	1
35	4
36	2
37	1
38	3
39	3
40	3
41	3
42	2
43	2
44	3
45	2
46	1
47	1
48	2
49	2
50	1
51	3
52	3
53	2
54	2
55	4
56	4
57	2
58	1
59	2
60	3
61	2
62	4
63	1
64	4
65	4
66	2
67	1
68	1
69	4
70	2
71	3
72	2
73	1
74	2
75	1
76	4
77	3
78	2
79	3
80	2
81	4
82	2
83	3
84	2
85	1
86	3
87	3
88	2
89	2
90	3
91	2
92	3
93	2
94	3
95	1
96	3
97	3
98	2
99	3

[1, 1, 2, 1, 2, 2, 2, 1, 3, 2, 1, 1, 4, 2, 2, 3, 3, 2, 2, 2, 2, 1, 3, 2, 1, 2, 2, 2, 2, 4, 2, 3, 3, 1, 4, 2, 1, 3, 3, 3, 3, 2, 2, 3, 2, 1, 1, 2, 2, 1, 3, 3, 2, 2, 4, 4, 2, 1, 2, 3, 2, 4, 1, 4, 4, 2, 1, 1, 4, 2, 3, 2, 1, 2, 1, 4, 3, 2, 3, 2, 4, 2, 3, 2, 1, 3, 3, 2, 2, 3, 2, 3, 2, 3, 1, 3, 3, 2, 3]

cp's OEIS Frontend

A023588 a(n) = sum of exponents in prime-power factorization of 2*prime(n)-1.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	3
10	2
11	1
12	1
13	4
14	2
15	2
16	3
17	3
18	2
19	2
20	2
21	2
22	1
23	3
24	2
25	1
26	2
27	2
28	2
29	2
30	4
31	2
32	3
33	3
34	1
35	4
36	2
37	1
38	3
39	3
40	3
41	3
42	2
43	2
44	3
45	2
46	1
47	1
48	2
49	2
50	1
51	3
52	3
53	2
54	2
55	4
56	4
57	2
58	1
59	2
60	3
61	2
62	4
63	1
64	4
65	4
66	2
67	1
68	1
69	4
70	2
71	3
72	2
73	1
74	2
75	1
76	4
77	3
78	2
79	3
80	2
81	4
82	2
83	3
84	2
85	1
86	3
87	3
88	2
89	2
90	3
91	2
92	3
93	2
94	3
95	1
96	3
97	3
98	2
99	3

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	3
10	2
11	1
12	1
13	4
14	2
15	2
16	3
17	3
18	2
19	2
20	2
21	2
22	1
23	3
24	2
25	1
26	2
27	2
28	2
29	2
30	4
31	2
32	3
33	3
34	1
35	4
36	2
37	1
38	3
39	3
40	3
41	3
42	2
43	2
44	3
45	2
46	1
47	1
48	2
49	2
50	1
51	3
52	3
53	2
54	2
55	4
56	4
57	2
58	1
59	2
60	3
61	2
62	4
63	1
64	4
65	4
66	2
67	1
68	1
69	4
70	2
71	3
72	2
73	1
74	2
75	1
76	4
77	3
78	2
79	3
80	2
81	4
82	2
83	3
84	2
85	1
86	3
87	3
88	2
89	2
90	3
91	2
92	3
93	2
94	3
95	1
96	3
97	3
98	2
99	3

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	3
10	2
11	1
12	1
13	4
14	2
15	2
16	3
17	3
18	2
19	2
20	2
21	2
22	1
23	3
24	2
25	1
26	2
27	2
28	2
29	2
30	4
31	2
32	3
33	3
34	1
35	4
36	2
37	1
38	3
39	3
40	3
41	3
42	2
43	2
44	3
45	2
46	1
47	1
48	2
49	2
50	1
51	3
52	3
53	2
54	2
55	4
56	4
57	2
58	1
59	2
60	3
61	2
62	4
63	1
64	4
65	4
66	2
67	1
68	1
69	4
70	2
71	3
72	2
73	1
74	2
75	1
76	4
77	3
78	2
79	3
80	2
81	4
82	2
83	3
84	2
85	1
86	3
87	3
88	2
89	2
90	3
91	2
92	3
93	2
94	3
95	1
96	3
97	3
98	2
99	3