A225387 - cp's OEIS frontend

A225387 Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,3,9, Q starts with 2,6, R starts with 4; at each stage the smallest number not yet present in P,Q,R is appended to R. Sequence gives R.

n	a(n)
1	4
2	5
3	7
4	8
5	10
6	12
7	13
8	14
9	15
10	16
11	17
12	19
13	21
14	22
15	23
16	24
17	25
18	27
19	28
20	29
21	30
22	31
23	32
24	33
25	34
26	35
27	37
28	39
29	40
30	41
31	42
32	43
33	44
34	45
35	46
36	47
37	49
38	50
39	51
40	52
41	53
42	54
43	55
44	56
45	57
46	58
47	59
48	60
49	62
50	63
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	76
62	77
63	78
64	79
65	80
66	81
67	82
68	83
69	84
70	85
71	86

[4, 5, 7, 8, 10, 12, 13, 14, 15, 16, 17, 19, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 37, 39, 40, 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86]

cp's OEIS Frontend

A225387 Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,3,9, Q starts with 2,6, R starts with 4; at each stage the smallest number not yet present in P,Q,R is appended to R. Sequence gives R.

Table of values

List of values

n	a(n)
1	4
2	5
3	7
4	8
5	10
6	12
7	13
8	14
9	15
10	16
11	17
12	19
13	21
14	22
15	23
16	24
17	25
18	27
19	28
20	29
21	30
22	31
23	32
24	33
25	34
26	35
27	37
28	39
29	40
30	41
31	42
32	43
33	44
34	45
35	46
36	47
37	49
38	50
39	51
40	52
41	53
42	54
43	55
44	56
45	57
46	58
47	59
48	60
49	62
50	63
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	76
62	77
63	78
64	79
65	80
66	81
67	82
68	83
69	84
70	85
71	86

n	a(n)
1	4
2	5
3	7
4	8
5	10
6	12
7	13
8	14
9	15
10	16
11	17
12	19
13	21
14	22
15	23
16	24
17	25
18	27
19	28
20	29
21	30
22	31
23	32
24	33
25	34
26	35
27	37
28	39
29	40
30	41
31	42
32	43
33	44
34	45
35	46
36	47
37	49
38	50
39	51
40	52
41	53
42	54
43	55
44	56
45	57
46	58
47	59
48	60
49	62
50	63
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	76
62	77
63	78
64	79
65	80
66	81
67	82
68	83
69	84
70	85
71	86

n	a(n)
1	4
2	5
3	7
4	8
5	10
6	12
7	13
8	14
9	15
10	16
11	17
12	19
13	21
14	22
15	23
16	24
17	25
18	27
19	28
20	29
21	30
22	31
23	32
24	33
25	34
26	35
27	37
28	39
29	40
30	41
31	42
32	43
33	44
34	45
35	46
36	47
37	49
38	50
39	51
40	52
41	53
42	54
43	55
44	56
45	57
46	58
47	59
48	60
49	62
50	63
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	76
62	77
63	78
64	79
65	80
66	81
67	82
68	83
69	84
70	85
71	86