A367949 - cp's OEIS frontend

A367949 Lexicographically earliest sequence of distinct positive integers such that the sum of the distinct prime factors (sopf) of a(n) + a(n + 1) is a perfect square.

n	a(n)
1	1
2	13
3	15
4	24
5	4
6	10
7	18
8	21
9	7
10	32
11	14
12	25
13	3
14	11
15	17
16	22
17	6
18	8
19	20
20	19
21	9
22	5
23	23
24	16
25	12
26	2
27	26
28	29
29	27
30	28
31	38
32	54
33	40
34	52
35	42
36	50
37	44
38	48
39	46
40	66
41	51
42	41
43	53
44	39
45	55
46	37
47	57
48	35
49	31
50	61
51	33
52	59
53	58
54	34
55	60
56	72
57	45
58	47
59	65
60	67
61	88
62	70
63	62
64	30
65	36
66	56
67	76
68	79
69	104
70	80

[1, 13, 15, 24, 4, 10, 18, 21, 7, 32, 14, 25, 3, 11, 17, 22, 6, 8, 20, 19, 9, 5, 23, 16, 12, 2, 26, 29, 27, 28, 38, 54, 40, 52, 42, 50, 44, 48, 46, 66, 51, 41, 53, 39, 55, 37, 57, 35, 31, 61, 33, 59, 58, 34, 60, 72, 45, 47, 65, 67, 88, 70, 62, 30, 36, 56, 76, 79, 104, 80]

cp's OEIS Frontend

A367949 Lexicographically earliest sequence of distinct positive integers such that the sum of the distinct prime factors (sopf) of a(n) + a(n + 1) is a perfect square.

Table of values

List of values

n	a(n)
1	1
2	13
3	15
4	24
5	4
6	10
7	18
8	21
9	7
10	32
11	14
12	25
13	3
14	11
15	17
16	22
17	6
18	8
19	20
20	19
21	9
22	5
23	23
24	16
25	12
26	2
27	26
28	29
29	27
30	28
31	38
32	54
33	40
34	52
35	42
36	50
37	44
38	48
39	46
40	66
41	51
42	41
43	53
44	39
45	55
46	37
47	57
48	35
49	31
50	61
51	33
52	59
53	58
54	34
55	60
56	72
57	45
58	47
59	65
60	67
61	88
62	70
63	62
64	30
65	36
66	56
67	76
68	79
69	104
70	80

n	a(n)
1	1
2	13
3	15
4	24
5	4
6	10
7	18
8	21
9	7
10	32
11	14
12	25
13	3
14	11
15	17
16	22
17	6
18	8
19	20
20	19
21	9
22	5
23	23
24	16
25	12
26	2
27	26
28	29
29	27
30	28
31	38
32	54
33	40
34	52
35	42
36	50
37	44
38	48
39	46
40	66
41	51
42	41
43	53
44	39
45	55
46	37
47	57
48	35
49	31
50	61
51	33
52	59
53	58
54	34
55	60
56	72
57	45
58	47
59	65
60	67
61	88
62	70
63	62
64	30
65	36
66	56
67	76
68	79
69	104
70	80

n	a(n)
1	1
2	13
3	15
4	24
5	4
6	10
7	18
8	21
9	7
10	32
11	14
12	25
13	3
14	11
15	17
16	22
17	6
18	8
19	20
20	19
21	9
22	5
23	23
24	16
25	12
26	2
27	26
28	29
29	27
30	28
31	38
32	54
33	40
34	52
35	42
36	50
37	44
38	48
39	46
40	66
41	51
42	41
43	53
44	39
45	55
46	37
47	57
48	35
49	31
50	61
51	33
52	59
53	58
54	34
55	60
56	72
57	45
58	47
59	65
60	67
61	88
62	70
63	62
64	30
65	36
66	56
67	76
68	79
69	104
70	80