A079051 - cp's OEIS frontend

A079051 Recamán variation: a(0) = 0; for n >= 1, a(n) = a(n-1) - f(n) if that number is positive and not already in the sequence, otherwise a(n) = a(n-1) + f(n), where f(n) = floor(sqrt(n)) (A000196).

n	a(n)
0	0
1	1
2	2
3	3
4	5
5	7
6	9
7	11
8	13
9	10
10	13
11	16
12	19
13	22
14	25
15	28
16	24
17	20
18	24
19	28
20	32
21	36
22	40
23	44
24	48
25	43
26	38
27	33
28	38
29	43
30	48
31	53
32	58
33	63
34	68
35	73
36	67
37	61
38	55
39	49
40	55
41	61
42	67
43	73
44	79
45	85
46	91
47	97
48	103
49	96
50	89
51	82
52	75
53	82
54	89
55	96
56	103
57	110
58	117
59	124
60	131
61	138
62	145
63	152
64	144
65	136
66	128
67	120

[0, 1, 2, 3, 5, 7, 9, 11, 13, 10, 13, 16, 19, 22, 25, 28, 24, 20, 24, 28, 32, 36, 40, 44, 48, 43, 38, 33, 38, 43, 48, 53, 58, 63, 68, 73, 67, 61, 55, 49, 55, 61, 67, 73, 79, 85, 91, 97, 103, 96, 89, 82, 75, 82, 89, 96, 103, 110, 117, 124, 131, 138, 145, 152, 144, 136, 128, 120]

cp's OEIS Frontend

A079051 Recamán variation: a(0) = 0; for n >= 1, a(n) = a(n-1) - f(n) if that number is positive and not already in the sequence, otherwise a(n) = a(n-1) + f(n), where f(n) = floor(sqrt(n)) (A000196).

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	5
5	7
6	9
7	11
8	13
9	10
10	13
11	16
12	19
13	22
14	25
15	28
16	24
17	20
18	24
19	28
20	32
21	36
22	40
23	44
24	48
25	43
26	38
27	33
28	38
29	43
30	48
31	53
32	58
33	63
34	68
35	73
36	67
37	61
38	55
39	49
40	55
41	61
42	67
43	73
44	79
45	85
46	91
47	97
48	103
49	96
50	89
51	82
52	75
53	82
54	89
55	96
56	103
57	110
58	117
59	124
60	131
61	138
62	145
63	152
64	144
65	136
66	128
67	120

n	a(n)
0	0
1	1
2	2
3	3
4	5
5	7
6	9
7	11
8	13
9	10
10	13
11	16
12	19
13	22
14	25
15	28
16	24
17	20
18	24
19	28
20	32
21	36
22	40
23	44
24	48
25	43
26	38
27	33
28	38
29	43
30	48
31	53
32	58
33	63
34	68
35	73
36	67
37	61
38	55
39	49
40	55
41	61
42	67
43	73
44	79
45	85
46	91
47	97
48	103
49	96
50	89
51	82
52	75
53	82
54	89
55	96
56	103
57	110
58	117
59	124
60	131
61	138
62	145
63	152
64	144
65	136
66	128
67	120

n	a(n)
0	0
1	1
2	2
3	3
4	5
5	7
6	9
7	11
8	13
9	10
10	13
11	16
12	19
13	22
14	25
15	28
16	24
17	20
18	24
19	28
20	32
21	36
22	40
23	44
24	48
25	43
26	38
27	33
28	38
29	43
30	48
31	53
32	58
33	63
34	68
35	73
36	67
37	61
38	55
39	49
40	55
41	61
42	67
43	73
44	79
45	85
46	91
47	97
48	103
49	96
50	89
51	82
52	75
53	82
54	89
55	96
56	103
57	110
58	117
59	124
60	131
61	138
62	145
63	152
64	144
65	136
66	128
67	120