A257717 - cp's OEIS frontend

A257717 a(n) is the smallest odd-indexed prime not included earlier such that a(n) + a(n-1) + a(n-2) is a prime, beginning with a(1) = 5 and a(2) = 11.

n	a(n)
1	5
2	11
3	31
4	17
5	23
6	67
7	41
8	59
9	73
10	47
11	103
12	83
13	97
14	127
15	149
16	157
17	137
18	167
19	283
20	191
21	179
22	109
23	211
24	227
25	313
26	233
27	197
28	331
29	241
30	257
31	379
32	347
33	307
34	367
35	389
36	277
37	353
38	401
39	439
40	269
41	509
42	499
43	419
44	449
45	571
46	431
47	487
48	563
49	461
50	547
51	523
52	587
53	599
54	661
55	607
56	761
57	631
58	677

[5, 11, 31, 17, 23, 67, 41, 59, 73, 47, 103, 83, 97, 127, 149, 157, 137, 167, 283, 191, 179, 109, 211, 227, 313, 233, 197, 331, 241, 257, 379, 347, 307, 367, 389, 277, 353, 401, 439, 269, 509, 499, 419, 449, 571, 431, 487, 563, 461, 547, 523, 587, 599, 661, 607, 761, 631, 677]

cp's OEIS Frontend

A257717 a(n) is the smallest odd-indexed prime not included earlier such that a(n) + a(n-1) + a(n-2) is a prime, beginning with a(1) = 5 and a(2) = 11.

Table of values

List of values

n	a(n)
1	5
2	11
3	31
4	17
5	23
6	67
7	41
8	59
9	73
10	47
11	103
12	83
13	97
14	127
15	149
16	157
17	137
18	167
19	283
20	191
21	179
22	109
23	211
24	227
25	313
26	233
27	197
28	331
29	241
30	257
31	379
32	347
33	307
34	367
35	389
36	277
37	353
38	401
39	439
40	269
41	509
42	499
43	419
44	449
45	571
46	431
47	487
48	563
49	461
50	547
51	523
52	587
53	599
54	661
55	607
56	761
57	631
58	677

n	a(n)
1	5
2	11
3	31
4	17
5	23
6	67
7	41
8	59
9	73
10	47
11	103
12	83
13	97
14	127
15	149
16	157
17	137
18	167
19	283
20	191
21	179
22	109
23	211
24	227
25	313
26	233
27	197
28	331
29	241
30	257
31	379
32	347
33	307
34	367
35	389
36	277
37	353
38	401
39	439
40	269
41	509
42	499
43	419
44	449
45	571
46	431
47	487
48	563
49	461
50	547
51	523
52	587
53	599
54	661
55	607
56	761
57	631
58	677

n	a(n)
1	5
2	11
3	31
4	17
5	23
6	67
7	41
8	59
9	73
10	47
11	103
12	83
13	97
14	127
15	149
16	157
17	137
18	167
19	283
20	191
21	179
22	109
23	211
24	227
25	313
26	233
27	197
28	331
29	241
30	257
31	379
32	347
33	307
34	367
35	389
36	277
37	353
38	401
39	439
40	269
41	509
42	499
43	419
44	449
45	571
46	431
47	487
48	563
49	461
50	547
51	523
52	587
53	599
54	661
55	607
56	761
57	631
58	677