A010440 - OEIS

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A010440 as a simple table

n	a(n)
1	0
2	1
3	2
4	4
5	5
6	8
7	9
8	10
9	11
10	13
11	16
12	18
13	19
14	20
15	21
16	22
17	23
18	25
19	26
20	31
21	32
22	36
23	38
24	40
25	42
26	44
27	45
28	46
29	49
30	50
31	51
32	52
33	55
34	62
35	64
36	65
37	67
38	72
39	73
40	76

[0,1,2,4,5,8,9,10,11,13,16,18,19,20,21,22,23,25, 26,31,32,36,38,40,42,44,45,46,49,50,51,52,55,62, 64,65,67,72,73,76]