A338938 - cp's OEIS frontend

A338938 a(1)=0. For n >= 2, let S be the sum of all nonprime digits in a(1), a(2), ... a(n-1) and let P be the next prime not already in the sequence. If S is a nonprime number less than P and not already in the sequence, a(n) = S. Otherwise, a(n) = P.

n	a(n)
1	0
2	2
3	3
4	5
5	7
6	11
7	13
8	17
9	4
10	8
11	16
12	19
13	23
14	29
15	31
16	37
17	41
18	43
19	47
20	53
21	56
22	59
23	61
24	67
25	71
26	73
27	79
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	131
38	137
39	139
40	149
41	151
42	157
43	163
44	167
45	173
46	179
47	181
48	191
49	193
50	197
51	199
52	211
53	223
54	227
55	229
56	233
57	239
58	241
59	251
60	257

[0, 2, 3, 5, 7, 11, 13, 17, 4, 8, 16, 19, 23, 29, 31, 37, 41, 43, 47, 53, 56, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257]

cp's OEIS Frontend

A338938 a(1)=0. For n >= 2, let S be the sum of all nonprime digits in a(1), a(2), ... a(n-1) and let P be the next prime not already in the sequence. If S is a nonprime number less than P and not already in the sequence, a(n) = S. Otherwise, a(n) = P.

Table of values

List of values

n	a(n)
1	0
2	2
3	3
4	5
5	7
6	11
7	13
8	17
9	4
10	8
11	16
12	19
13	23
14	29
15	31
16	37
17	41
18	43
19	47
20	53
21	56
22	59
23	61
24	67
25	71
26	73
27	79
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	131
38	137
39	139
40	149
41	151
42	157
43	163
44	167
45	173
46	179
47	181
48	191
49	193
50	197
51	199
52	211
53	223
54	227
55	229
56	233
57	239
58	241
59	251
60	257

n	a(n)
1	0
2	2
3	3
4	5
5	7
6	11
7	13
8	17
9	4
10	8
11	16
12	19
13	23
14	29
15	31
16	37
17	41
18	43
19	47
20	53
21	56
22	59
23	61
24	67
25	71
26	73
27	79
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	131
38	137
39	139
40	149
41	151
42	157
43	163
44	167
45	173
46	179
47	181
48	191
49	193
50	197
51	199
52	211
53	223
54	227
55	229
56	233
57	239
58	241
59	251
60	257

n	a(n)
1	0
2	2
3	3
4	5
5	7
6	11
7	13
8	17
9	4
10	8
11	16
12	19
13	23
14	29
15	31
16	37
17	41
18	43
19	47
20	53
21	56
22	59
23	61
24	67
25	71
26	73
27	79
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	131
38	137
39	139
40	149
41	151
42	157
43	163
44	167
45	173
46	179
47	181
48	191
49	193
50	197
51	199
52	211
53	223
54	227
55	229
56	233
57	239
58	241
59	251
60	257