A138724 - cp's OEIS frontend

A138724 Atomic numbers of the periodic table of the elements, read downwards along 18 columns, up to the 7th period.

n	a(n)
1	1
2	3
3	11
4	19
5	37
6	55
7	87
8	4
9	12
10	20
11	38
12	56
13	88
14	21
15	39
16	57
17	89
18	22
19	40
20	72
21	104
22	23
23	41
24	73
25	105
26	24
27	42
28	74
29	106
30	25
31	43
32	75
33	107
34	26
35	44
36	76
37	108
38	27
39	45
40	77
41	109
42	28
43	46
44	78
45	110
46	29
47	47
48	79
49	111
50	30
51	48
52	80
53	112
54	5
55	13
56	31
57	49
58	81
59	113

[1, 3, 11, 19, 37, 55, 87, 4, 12, 20, 38, 56, 88, 21, 39, 57, 89, 22, 40, 72, 104, 23, 41, 73, 105, 24, 42, 74, 106, 25, 43, 75, 107, 26, 44, 76, 108, 27, 45, 77, 109, 28, 46, 78, 110, 29, 47, 79, 111, 30, 48, 80, 112, 5, 13, 31, 49, 81, 113]

cp's OEIS Frontend

A138724 Atomic numbers of the periodic table of the elements, read downwards along 18 columns, up to the 7th period.

Table of values

List of values

n	a(n)
1	1
2	3
3	11
4	19
5	37
6	55
7	87
8	4
9	12
10	20
11	38
12	56
13	88
14	21
15	39
16	57
17	89
18	22
19	40
20	72
21	104
22	23
23	41
24	73
25	105
26	24
27	42
28	74
29	106
30	25
31	43
32	75
33	107
34	26
35	44
36	76
37	108
38	27
39	45
40	77
41	109
42	28
43	46
44	78
45	110
46	29
47	47
48	79
49	111
50	30
51	48
52	80
53	112
54	5
55	13
56	31
57	49
58	81
59	113

n	a(n)
1	1
2	3
3	11
4	19
5	37
6	55
7	87
8	4
9	12
10	20
11	38
12	56
13	88
14	21
15	39
16	57
17	89
18	22
19	40
20	72
21	104
22	23
23	41
24	73
25	105
26	24
27	42
28	74
29	106
30	25
31	43
32	75
33	107
34	26
35	44
36	76
37	108
38	27
39	45
40	77
41	109
42	28
43	46
44	78
45	110
46	29
47	47
48	79
49	111
50	30
51	48
52	80
53	112
54	5
55	13
56	31
57	49
58	81
59	113

n	a(n)
1	1
2	3
3	11
4	19
5	37
6	55
7	87
8	4
9	12
10	20
11	38
12	56
13	88
14	21
15	39
16	57
17	89
18	22
19	40
20	72
21	104
22	23
23	41
24	73
25	105
26	24
27	42
28	74
29	106
30	25
31	43
32	75
33	107
34	26
35	44
36	76
37	108
38	27
39	45
40	77
41	109
42	28
43	46
44	78
45	110
46	29
47	47
48	79
49	111
50	30
51	48
52	80
53	112
54	5
55	13
56	31
57	49
58	81
59	113