A026447 - cp's OEIS frontend

A026447 a(n) = least positive integer > a(n-1) and not a(i)*a(j)+2 for 1<=i with initial terms 3,4.

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	12
11	13
12	15
13	16
14	18
15	19
16	21
17	24
18	25
19	27
20	28
21	31
22	33
23	36
24	39
25	40
26	43
27	45
28	48
29	49
30	51
31	53
32	55
33	60
34	61
35	63
36	64
37	69
38	70
39	71
40	73
41	75
42	76
43	81
44	84
45	85
46	87
47	88
48	89
49	91
50	94
51	96
52	99
53	100
54	103
55	104
56	105
57	108
58	109
59	111
60	113

[3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 18, 19, 21, 24, 25, 27, 28, 31, 33, 36, 39, 40, 43, 45, 48, 49, 51, 53, 55, 60, 61, 63, 64, 69, 70, 71, 73, 75, 76, 81, 84, 85, 87, 88, 89, 91, 94, 96, 99, 100, 103, 104, 105, 108, 109, 111, 113]

cp's OEIS Frontend

A026447 a(n) = least positive integer > a(n-1) and not a(i)*a(j)+2 for 1<=i with initial terms 3,4.

Table of values

List of values

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	12
11	13
12	15
13	16
14	18
15	19
16	21
17	24
18	25
19	27
20	28
21	31
22	33
23	36
24	39
25	40
26	43
27	45
28	48
29	49
30	51
31	53
32	55
33	60
34	61
35	63
36	64
37	69
38	70
39	71
40	73
41	75
42	76
43	81
44	84
45	85
46	87
47	88
48	89
49	91
50	94
51	96
52	99
53	100
54	103
55	104
56	105
57	108
58	109
59	111
60	113

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	12
11	13
12	15
13	16
14	18
15	19
16	21
17	24
18	25
19	27
20	28
21	31
22	33
23	36
24	39
25	40
26	43
27	45
28	48
29	49
30	51
31	53
32	55
33	60
34	61
35	63
36	64
37	69
38	70
39	71
40	73
41	75
42	76
43	81
44	84
45	85
46	87
47	88
48	89
49	91
50	94
51	96
52	99
53	100
54	103
55	104
56	105
57	108
58	109
59	111
60	113

n	a(n)
1	3
2	4
3	5
4	6
5	7
6	8
7	9
8	10
9	11
10	12
11	13
12	15
13	16
14	18
15	19
16	21
17	24
18	25
19	27
20	28
21	31
22	33
23	36
24	39
25	40
26	43
27	45
28	48
29	49
30	51
31	53
32	55
33	60
34	61
35	63
36	64
37	69
38	70
39	71
40	73
41	75
42	76
43	81
44	84
45	85
46	87
47	88
48	89
49	91
50	94
51	96
52	99
53	100
54	103
55	104
56	105
57	108
58	109
59	111
60	113