A030391 - cp's OEIS frontend

A030391 a(n)=least k such that base 4 representation of n begins at s(k), where s=A030386.

n	a(n)
1	1
2	2
3	3
4	11
5	5
6	1
7	9
8	19
9	8
10	15
11	2
12	3
13	10
14	18
15	25
16	75
17	31
18	11
19	63
20	30
21	5
22	6
23	47
24	33
25	7
26	14
27	1
28	36
29	9
30	22
31	72
32	123
33	34
34	82
35	19
36	62
37	46
38	13
39	8
40	81
41	58
42	15
43	16
44	2
45	70
46	17
47	24
48	27
49	3
50	85
51	133
52	10
53	49
54	68
55	21
56	18
57	61
58	109
59	23
60	26
61	73
62	121
63	25
64	427
65	176

[1, 2, 3, 11, 5, 1, 9, 19, 8, 15, 2, 3, 10, 18, 25, 75, 31, 11, 63, 30, 5, 6, 47, 33, 7, 14, 1, 36, 9, 22, 72, 123, 34, 82, 19, 62, 46, 13, 8, 81, 58, 15, 16, 2, 70, 17, 24, 27, 3, 85, 133, 10, 49, 68, 21, 18, 61, 109, 23, 26, 73, 121, 25, 427, 176]

cp's OEIS Frontend

A030391 a(n)=least k such that base 4 representation of n begins at s(k), where s=A030386.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	11
5	5
6	1
7	9
8	19
9	8
10	15
11	2
12	3
13	10
14	18
15	25
16	75
17	31
18	11
19	63
20	30
21	5
22	6
23	47
24	33
25	7
26	14
27	1
28	36
29	9
30	22
31	72
32	123
33	34
34	82
35	19
36	62
37	46
38	13
39	8
40	81
41	58
42	15
43	16
44	2
45	70
46	17
47	24
48	27
49	3
50	85
51	133
52	10
53	49
54	68
55	21
56	18
57	61
58	109
59	23
60	26
61	73
62	121
63	25
64	427
65	176

n	a(n)
1	1
2	2
3	3
4	11
5	5
6	1
7	9
8	19
9	8
10	15
11	2
12	3
13	10
14	18
15	25
16	75
17	31
18	11
19	63
20	30
21	5
22	6
23	47
24	33
25	7
26	14
27	1
28	36
29	9
30	22
31	72
32	123
33	34
34	82
35	19
36	62
37	46
38	13
39	8
40	81
41	58
42	15
43	16
44	2
45	70
46	17
47	24
48	27
49	3
50	85
51	133
52	10
53	49
54	68
55	21
56	18
57	61
58	109
59	23
60	26
61	73
62	121
63	25
64	427
65	176

n	a(n)
1	1
2	2
3	3
4	11
5	5
6	1
7	9
8	19
9	8
10	15
11	2
12	3
13	10
14	18
15	25
16	75
17	31
18	11
19	63
20	30
21	5
22	6
23	47
24	33
25	7
26	14
27	1
28	36
29	9
30	22
31	72
32	123
33	34
34	82
35	19
36	62
37	46
38	13
39	8
40	81
41	58
42	15
43	16
44	2
45	70
46	17
47	24
48	27
49	3
50	85
51	133
52	10
53	49
54	68
55	21
56	18
57	61
58	109
59	23
60	26
61	73
62	121
63	25
64	427
65	176