A307213 - cp's OEIS frontend

A307213 Divide the natural numbers into sets of successive sizes 3,4,5,6,7,...,, starting with {1,2,3}. Cycle through each set until you reach a prime; if the prime was the n-th element in its set, jump to the n-th element of the next set.

n	a(n)
1	1
2	2
3	5
4	9
5	10
6	11
7	16
8	17
9	23
10	30
11	31
12	39
13	40
14	41
15	50
16	51
17	52
18	43
19	53
20	64
21	65
22	66
23	67
24	79
25	92
26	93
27	94
28	95
29	96
30	97
31	111
32	112
33	113
34	128
35	129
36	130
37	131
38	147
39	148
40	149
41	166
42	167
43	185
44	186
45	187
46	169
47	170
48	171
49	172
50	173
51	192
52	193
53	213
54	214
55	215
56	216
57	217
58	218
59	219
60	220
61	221
62	222
63	223
64	244
65	245
66	246
67	247
68	248
69	249
70	250
71	229

[1, 2, 5, 9, 10, 11, 16, 17, 23, 30, 31, 39, 40, 41, 50, 51, 52, 43, 53, 64, 65, 66, 67, 79, 92, 93, 94, 95, 96, 97, 111, 112, 113, 128, 129, 130, 131, 147, 148, 149, 166, 167, 185, 186, 187, 169, 170, 171, 172, 173, 192, 193, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 244, 245, 246, 247, 248, 249, 250, 229]

cp's OEIS Frontend

A307213 Divide the natural numbers into sets of successive sizes 3,4,5,6,7,...,, starting with {1,2,3}. Cycle through each set until you reach a prime; if the prime was the n-th element in its set, jump to the n-th element of the next set.

Table of values

List of values

n	a(n)
1	1
2	2
3	5
4	9
5	10
6	11
7	16
8	17
9	23
10	30
11	31
12	39
13	40
14	41
15	50
16	51
17	52
18	43
19	53
20	64
21	65
22	66
23	67
24	79
25	92
26	93
27	94
28	95
29	96
30	97
31	111
32	112
33	113
34	128
35	129
36	130
37	131
38	147
39	148
40	149
41	166
42	167
43	185
44	186
45	187
46	169
47	170
48	171
49	172
50	173
51	192
52	193
53	213
54	214
55	215
56	216
57	217
58	218
59	219
60	220
61	221
62	222
63	223
64	244
65	245
66	246
67	247
68	248
69	249
70	250
71	229

n	a(n)
1	1
2	2
3	5
4	9
5	10
6	11
7	16
8	17
9	23
10	30
11	31
12	39
13	40
14	41
15	50
16	51
17	52
18	43
19	53
20	64
21	65
22	66
23	67
24	79
25	92
26	93
27	94
28	95
29	96
30	97
31	111
32	112
33	113
34	128
35	129
36	130
37	131
38	147
39	148
40	149
41	166
42	167
43	185
44	186
45	187
46	169
47	170
48	171
49	172
50	173
51	192
52	193
53	213
54	214
55	215
56	216
57	217
58	218
59	219
60	220
61	221
62	222
63	223
64	244
65	245
66	246
67	247
68	248
69	249
70	250
71	229

n	a(n)
1	1
2	2
3	5
4	9
5	10
6	11
7	16
8	17
9	23
10	30
11	31
12	39
13	40
14	41
15	50
16	51
17	52
18	43
19	53
20	64
21	65
22	66
23	67
24	79
25	92
26	93
27	94
28	95
29	96
30	97
31	111
32	112
33	113
34	128
35	129
36	130
37	131
38	147
39	148
40	149
41	166
42	167
43	185
44	186
45	187
46	169
47	170
48	171
49	172
50	173
51	192
52	193
53	213
54	214
55	215
56	216
57	217
58	218
59	219
60	220
61	221
62	222
63	223
64	244
65	245
66	246
67	247
68	248
69	249
70	250
71	229