A133640 - cp's OEIS frontend

A133640 List of pairs n,4n, where n is the least unused number so far.

n	a(n)
1	1
2	4
3	2
4	8
5	3
6	12
7	5
8	20
9	6
10	24
11	7
12	28
13	9
14	36
15	10
16	40
17	11
18	44
19	13
20	52
21	14
22	56
23	15
24	60
25	16
26	64
27	17
28	68
29	18
30	72
31	19
32	76
33	21
34	84
35	22
36	88
37	23
38	92
39	25
40	100
41	26
42	104
43	27
44	108
45	29
46	116
47	30
48	120
49	31
50	124
51	32
52	128
53	33
54	132
55	34
56	136
57	35
58	140
59	37
60	148
61	38
62	152
63	39
64	156

[1, 4, 2, 8, 3, 12, 5, 20, 6, 24, 7, 28, 9, 36, 10, 40, 11, 44, 13, 52, 14, 56, 15, 60, 16, 64, 17, 68, 18, 72, 19, 76, 21, 84, 22, 88, 23, 92, 25, 100, 26, 104, 27, 108, 29, 116, 30, 120, 31, 124, 32, 128, 33, 132, 34, 136, 35, 140, 37, 148, 38, 152, 39, 156]

cp's OEIS Frontend

A133640 List of pairs n,4n, where n is the least unused number so far.

Table of values

List of values

n	a(n)
1	1
2	4
3	2
4	8
5	3
6	12
7	5
8	20
9	6
10	24
11	7
12	28
13	9
14	36
15	10
16	40
17	11
18	44
19	13
20	52
21	14
22	56
23	15
24	60
25	16
26	64
27	17
28	68
29	18
30	72
31	19
32	76
33	21
34	84
35	22
36	88
37	23
38	92
39	25
40	100
41	26
42	104
43	27
44	108
45	29
46	116
47	30
48	120
49	31
50	124
51	32
52	128
53	33
54	132
55	34
56	136
57	35
58	140
59	37
60	148
61	38
62	152
63	39
64	156

n	a(n)
1	1
2	4
3	2
4	8
5	3
6	12
7	5
8	20
9	6
10	24
11	7
12	28
13	9
14	36
15	10
16	40
17	11
18	44
19	13
20	52
21	14
22	56
23	15
24	60
25	16
26	64
27	17
28	68
29	18
30	72
31	19
32	76
33	21
34	84
35	22
36	88
37	23
38	92
39	25
40	100
41	26
42	104
43	27
44	108
45	29
46	116
47	30
48	120
49	31
50	124
51	32
52	128
53	33
54	132
55	34
56	136
57	35
58	140
59	37
60	148
61	38
62	152
63	39
64	156

n	a(n)
1	1
2	4
3	2
4	8
5	3
6	12
7	5
8	20
9	6
10	24
11	7
12	28
13	9
14	36
15	10
16	40
17	11
18	44
19	13
20	52
21	14
22	56
23	15
24	60
25	16
26	64
27	17
28	68
29	18
30	72
31	19
32	76
33	21
34	84
35	22
36	88
37	23
38	92
39	25
40	100
41	26
42	104
43	27
44	108
45	29
46	116
47	30
48	120
49	31
50	124
51	32
52	128
53	33
54	132
55	34
56	136
57	35
58	140
59	37
60	148
61	38
62	152
63	39
64	156