A079052 - cp's OEIS frontend

A079052 Recamán variation: a(1) = 1; 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)=phi(n) (cf. A000010).

n	a(n)
1	1
2	2
3	4
4	6
5	10
6	8
7	14
8	18
9	12
10	16
11	26
12	22
13	34
14	28
15	20
16	28
17	44
18	38
19	56
20	48
21	36
22	46
23	24
24	32
25	52
26	40
27	58
28	70
29	42
30	50
31	80
32	64
33	84
34	68
35	92
36	104
37	140
38	122
39	98
40	82
41	122
42	110
43	152
44	132
45	108
46	86
47	132
48	116
49	74
50	54
51	86
52	62
53	114
54	96
55	136
56	112
57	76
58	104
59	162
60	146
61	206
62	176
63	212
64	180
65	228

[1, 2, 4, 6, 10, 8, 14, 18, 12, 16, 26, 22, 34, 28, 20, 28, 44, 38, 56, 48, 36, 46, 24, 32, 52, 40, 58, 70, 42, 50, 80, 64, 84, 68, 92, 104, 140, 122, 98, 82, 122, 110, 152, 132, 108, 86, 132, 116, 74, 54, 86, 62, 114, 96, 136, 112, 76, 104, 162, 146, 206, 176, 212, 180, 228]

cp's OEIS Frontend

A079052 Recamán variation: a(1) = 1; 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)=phi(n) (cf. A000010).

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	10
6	8
7	14
8	18
9	12
10	16
11	26
12	22
13	34
14	28
15	20
16	28
17	44
18	38
19	56
20	48
21	36
22	46
23	24
24	32
25	52
26	40
27	58
28	70
29	42
30	50
31	80
32	64
33	84
34	68
35	92
36	104
37	140
38	122
39	98
40	82
41	122
42	110
43	152
44	132
45	108
46	86
47	132
48	116
49	74
50	54
51	86
52	62
53	114
54	96
55	136
56	112
57	76
58	104
59	162
60	146
61	206
62	176
63	212
64	180
65	228

n	a(n)
1	1
2	2
3	4
4	6
5	10
6	8
7	14
8	18
9	12
10	16
11	26
12	22
13	34
14	28
15	20
16	28
17	44
18	38
19	56
20	48
21	36
22	46
23	24
24	32
25	52
26	40
27	58
28	70
29	42
30	50
31	80
32	64
33	84
34	68
35	92
36	104
37	140
38	122
39	98
40	82
41	122
42	110
43	152
44	132
45	108
46	86
47	132
48	116
49	74
50	54
51	86
52	62
53	114
54	96
55	136
56	112
57	76
58	104
59	162
60	146
61	206
62	176
63	212
64	180
65	228

n	a(n)
1	1
2	2
3	4
4	6
5	10
6	8
7	14
8	18
9	12
10	16
11	26
12	22
13	34
14	28
15	20
16	28
17	44
18	38
19	56
20	48
21	36
22	46
23	24
24	32
25	52
26	40
27	58
28	70
29	42
30	50
31	80
32	64
33	84
34	68
35	92
36	104
37	140
38	122
39	98
40	82
41	122
42	110
43	152
44	132
45	108
46	86
47	132
48	116
49	74
50	54
51	86
52	62
53	114
54	96
55	136
56	112
57	76
58	104
59	162
60	146
61	206
62	176
63	212
64	180
65	228