A377938 - OEIS

A377938 as a simple table

n	a(n)
1	2
2	3
3	4
4	-1
5	6
6	11
7	10
8	11
9	-1
10	17
11	13
12	17
13	19
14	17
15	19
16	-1
17	22
18	29
19	22
20	23
21	23
22	25
23	25
24	31
25	-1
26	29
27	29
28	41
29	34
30	41
31	34
32	37
33	38
34	41
35	37
36	-1
37	46
38	47
39	47
40	47
41	47
42	59
43	46
44	47
45	47
46	67
47	49
48	53
49	-1
50	53
51	53
52	59
53	62
54	59
55	58
56	59
57	67
58	73
59	61
60	73
61	67
62	71
63	67
64	-1
65	71
66	79
67	71
68	71
69	71
70	79
71	82
72	83
73	83
74	79
75	79

[2,3,4,-1,6,11,10,11,-1,17,13,17,19,17,19,-1,22, 29,22,23,23,25,25,31,-1,29,29,41,34,41,34,37,38, 41,37,-1,46,47,47,47,47,59,46,47,47,67,49,53,-1, 53,53,59,62,59,58,59,67,73,61,73,67,71,67,-1,71, 79,71,71,71,79,82,83,83,79,79]

n	a(n)
1	2
2	3
3	4
4	-1
5	6
6	11
7	10
8	11
9	-1
10	17
11	13
12	17
13	19
14	17
15	19
16	-1
17	22
18	29
19	22
20	23
21	23
22	25
23	25
24	31
25	-1
26	29
27	29
28	41
29	34
30	41
31	34
32	37
33	38
34	41
35	37
36	-1
37	46
38	47
39	47
40	47
41	47
42	59
43	46
44	47
45	47
46	67
47	49
48	53
49	-1
50	53
51	53
52	59
53	62
54	59
55	58
56	59
57	67
58	73
59	61
60	73
61	67
62	71
63	67
64	-1
65	71
66	79
67	71
68	71
69	71
70	79
71	82
72	83
73	83
74	79
75	79

n	a(n)
1	2
2	3
3	4
4	-1
5	6
6	11
7	10
8	11
9	-1
10	17
11	13
12	17
13	19
14	17
15	19
16	-1
17	22
18	29
19	22
20	23
21	23
22	25
23	25
24	31
25	-1
26	29
27	29
28	41
29	34
30	41
31	34
32	37
33	38
34	41
35	37
36	-1
37	46
38	47
39	47
40	47
41	47
42	59
43	46
44	47
45	47
46	67
47	49
48	53
49	-1
50	53
51	53
52	59
53	62
54	59
55	58
56	59
57	67
58	73
59	61
60	73
61	67
62	71
63	67
64	-1
65	71
66	79
67	71
68	71
69	71
70	79
71	82
72	83
73	83
74	79
75	79

n	a(n)
1	2
2	3
3	4
4	-1
5	6
6	11
7	10
8	11
9	-1
10	17
11	13
12	17
13	19
14	17
15	19
16	-1
17	22
18	29
19	22
20	23
21	23
22	25
23	25
24	31
25	-1
26	29
27	29
28	41
29	34
30	41
31	34
32	37
33	38
34	41
35	37
36	-1
37	46
38	47
39	47
40	47
41	47
42	59
43	46
44	47
45	47
46	67
47	49
48	53
49	-1
50	53
51	53
52	59
53	62
54	59
55	58
56	59
57	67
58	73
59	61
60	73
61	67
62	71
63	67
64	-1
65	71
66	79
67	71
68	71
69	71
70	79
71	82
72	83
73	83
74	79
75	79