A085951 - cp's OEIS frontend

A085951 For n <= 5, a(n) = 2n-1. For n > 5, a(n) is the least odd number not already used that begins with the last digit of a(n-1).

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	91
7	11
8	13
9	31
10	15
11	51
12	17
13	71
14	19
15	93
16	33
17	35
18	53
19	37
20	73
21	39
22	95
23	55
24	57
25	75
26	59
27	97
28	77
29	79
30	99
31	901
32	101
33	103
34	301
35	105
36	501
37	107
38	701
39	109
40	903
41	303
42	305
43	503
44	307
45	703
46	309
47	905
48	505
49	507
50	705
51	509
52	907
53	707
54	709
55	909
56	911
57	111
58	113
59	311
60	115
61	511

[1, 3, 5, 7, 9, 91, 11, 13, 31, 15, 51, 17, 71, 19, 93, 33, 35, 53, 37, 73, 39, 95, 55, 57, 75, 59, 97, 77, 79, 99, 901, 101, 103, 301, 105, 501, 107, 701, 109, 903, 303, 305, 503, 307, 703, 309, 905, 505, 507, 705, 509, 907, 707, 709, 909, 911, 111, 113, 311, 115, 511]

cp's OEIS Frontend

A085951 For n <= 5, a(n) = 2n-1. For n > 5, a(n) is the least odd number not already used that begins with the last digit of a(n-1).

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	91
7	11
8	13
9	31
10	15
11	51
12	17
13	71
14	19
15	93
16	33
17	35
18	53
19	37
20	73
21	39
22	95
23	55
24	57
25	75
26	59
27	97
28	77
29	79
30	99
31	901
32	101
33	103
34	301
35	105
36	501
37	107
38	701
39	109
40	903
41	303
42	305
43	503
44	307
45	703
46	309
47	905
48	505
49	507
50	705
51	509
52	907
53	707
54	709
55	909
56	911
57	111
58	113
59	311
60	115
61	511

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	91
7	11
8	13
9	31
10	15
11	51
12	17
13	71
14	19
15	93
16	33
17	35
18	53
19	37
20	73
21	39
22	95
23	55
24	57
25	75
26	59
27	97
28	77
29	79
30	99
31	901
32	101
33	103
34	301
35	105
36	501
37	107
38	701
39	109
40	903
41	303
42	305
43	503
44	307
45	703
46	309
47	905
48	505
49	507
50	705
51	509
52	907
53	707
54	709
55	909
56	911
57	111
58	113
59	311
60	115
61	511

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	91
7	11
8	13
9	31
10	15
11	51
12	17
13	71
14	19
15	93
16	33
17	35
18	53
19	37
20	73
21	39
22	95
23	55
24	57
25	75
26	59
27	97
28	77
29	79
30	99
31	901
32	101
33	103
34	301
35	105
36	501
37	107
38	701
39	109
40	903
41	303
42	305
43	503
44	307
45	703
46	309
47	905
48	505
49	507
50	705
51	509
52	907
53	707
54	709
55	909
56	911
57	111
58	113
59	311
60	115
61	511