A047220 - OEIS

A047220 as a simple table

n	a(n)
1	0
2	1
3	3
4	5
5	6
6	8
7	10
8	11
9	13
10	15
11	16
12	18
13	20
14	21
15	23
16	25
17	26
18	28
19	30
20	31
21	33
22	35
23	36
24	38
25	40
26	41
27	43
28	45
29	46
30	48
31	50
32	51
33	53
34	55
35	56
36	58
37	60
38	61
39	63
40	65
41	66
42	68
43	70
44	71
45	73
46	75
47	76
48	78
49	80
50	81
51	83
52	85
53	86
54	88
55	90
56	91
57	93
58	95
59	96
60	98
61	100
62	101
63	103
64	105
65	106

[0,1,3,5,6,8,10,11,13,15,16,18,20,21,23,25,26,28, 30,31,33,35,36,38,40,41,43,45,46,48,50,51,53,55, 56,58,60,61,63,65,66,68,70,71,73,75,76,78,80,81, 83,85,86,88,90,91,93,95,96,98,100,101,103,105,106]

n	a(n)
1	0
2	1
3	3
4	5
5	6
6	8
7	10
8	11
9	13
10	15
11	16
12	18
13	20
14	21
15	23
16	25
17	26
18	28
19	30
20	31
21	33
22	35
23	36
24	38
25	40
26	41
27	43
28	45
29	46
30	48
31	50
32	51
33	53
34	55
35	56
36	58
37	60
38	61
39	63
40	65
41	66
42	68
43	70
44	71
45	73
46	75
47	76
48	78
49	80
50	81
51	83
52	85
53	86
54	88
55	90
56	91
57	93
58	95
59	96
60	98
61	100
62	101
63	103
64	105
65	106

n	a(n)
1	0
2	1
3	3
4	5
5	6
6	8
7	10
8	11
9	13
10	15
11	16
12	18
13	20
14	21
15	23
16	25
17	26
18	28
19	30
20	31
21	33
22	35
23	36
24	38
25	40
26	41
27	43
28	45
29	46
30	48
31	50
32	51
33	53
34	55
35	56
36	58
37	60
38	61
39	63
40	65
41	66
42	68
43	70
44	71
45	73
46	75
47	76
48	78
49	80
50	81
51	83
52	85
53	86
54	88
55	90
56	91
57	93
58	95
59	96
60	98
61	100
62	101
63	103
64	105
65	106

n	a(n)
1	0
2	1
3	3
4	5
5	6
6	8
7	10
8	11
9	13
10	15
11	16
12	18
13	20
14	21
15	23
16	25
17	26
18	28
19	30
20	31
21	33
22	35
23	36
24	38
25	40
26	41
27	43
28	45
29	46
30	48
31	50
32	51
33	53
34	55
35	56
36	58
37	60
38	61
39	63
40	65
41	66
42	68
43	70
44	71
45	73
46	75
47	76
48	78
49	80
50	81
51	83
52	85
53	86
54	88
55	90
56	91
57	93
58	95
59	96
60	98
61	100
62	101
63	103
64	105
65	106