A247476 - cp's OEIS frontend

A247476 A Skolem-type sequence: each pair of two terms that start with a digit k are separated by k other terms. Lexicographically earliest permutation of positive integers with this property.

n	a(n)
1	1
2	2
3	10
4	3
5	20
6	4
7	5
8	30
9	6
10	7
11	40
12	8
13	50
14	9
15	11
16	60
17	12
18	70
19	21
20	41
21	80
22	22
23	23
24	90
25	42
26	24
27	13
28	25
29	14
30	15
31	26
32	16
33	17
34	27
35	18
36	19
37	28
38	100
39	29
40	31
41	43
42	200
43	51
44	32
45	61
46	44
47	33
48	45
49	52
50	53
51	34
52	62
53	46
54	35
55	47
56	54
57	55
58	36
59	63
60	48
61	37
62	49
63	56
64	57
65	38
66	64
67	400

[1, 2, 10, 3, 20, 4, 5, 30, 6, 7, 40, 8, 50, 9, 11, 60, 12, 70, 21, 41, 80, 22, 23, 90, 42, 24, 13, 25, 14, 15, 26, 16, 17, 27, 18, 19, 28, 100, 29, 31, 43, 200, 51, 32, 61, 44, 33, 45, 52, 53, 34, 62, 46, 35, 47, 54, 55, 36, 63, 48, 37, 49, 56, 57, 38, 64, 400]

cp's OEIS Frontend

A247476 A Skolem-type sequence: each pair of two terms that start with a digit k are separated by k other terms. Lexicographically earliest permutation of positive integers with this property.

Table of values

List of values

n	a(n)
1	1
2	2
3	10
4	3
5	20
6	4
7	5
8	30
9	6
10	7
11	40
12	8
13	50
14	9
15	11
16	60
17	12
18	70
19	21
20	41
21	80
22	22
23	23
24	90
25	42
26	24
27	13
28	25
29	14
30	15
31	26
32	16
33	17
34	27
35	18
36	19
37	28
38	100
39	29
40	31
41	43
42	200
43	51
44	32
45	61
46	44
47	33
48	45
49	52
50	53
51	34
52	62
53	46
54	35
55	47
56	54
57	55
58	36
59	63
60	48
61	37
62	49
63	56
64	57
65	38
66	64
67	400

n	a(n)
1	1
2	2
3	10
4	3
5	20
6	4
7	5
8	30
9	6
10	7
11	40
12	8
13	50
14	9
15	11
16	60
17	12
18	70
19	21
20	41
21	80
22	22
23	23
24	90
25	42
26	24
27	13
28	25
29	14
30	15
31	26
32	16
33	17
34	27
35	18
36	19
37	28
38	100
39	29
40	31
41	43
42	200
43	51
44	32
45	61
46	44
47	33
48	45
49	52
50	53
51	34
52	62
53	46
54	35
55	47
56	54
57	55
58	36
59	63
60	48
61	37
62	49
63	56
64	57
65	38
66	64
67	400

n	a(n)
1	1
2	2
3	10
4	3
5	20
6	4
7	5
8	30
9	6
10	7
11	40
12	8
13	50
14	9
15	11
16	60
17	12
18	70
19	21
20	41
21	80
22	22
23	23
24	90
25	42
26	24
27	13
28	25
29	14
30	15
31	26
32	16
33	17
34	27
35	18
36	19
37	28
38	100
39	29
40	31
41	43
42	200
43	51
44	32
45	61
46	44
47	33
48	45
49	52
50	53
51	34
52	62
53	46
54	35
55	47
56	54
57	55
58	36
59	63
60	48
61	37
62	49
63	56
64	57
65	38
66	64
67	400