A080901 - cp's OEIS frontend

A080901 a(1)=2; for n>1, a(n)=a(n-1)-2 if n is already in the sequence, a(n)=a(n-1)+5 otherwise.

n	a(n)
1	2
2	0
3	5
4	10
5	8
6	13
7	18
8	16
9	21
10	19
11	24
12	29
13	27
14	32
15	37
16	35
17	40
18	38
19	36
20	41
21	39
22	44
23	49
24	47
25	52
26	57
27	55
28	60
29	58
30	63
31	68
32	66
33	71
34	76
35	74
36	72
37	70
38	68
39	66
40	64
41	62
42	67
43	72
44	70
45	75
46	80
47	78
48	83
49	81
50	86
51	91
52	89
53	94
54	99
55	97
56	102
57	100
58	98
59	103
60	101
61	106
62	104
63	102
64	100

[2, 0, 5, 10, 8, 13, 18, 16, 21, 19, 24, 29, 27, 32, 37, 35, 40, 38, 36, 41, 39, 44, 49, 47, 52, 57, 55, 60, 58, 63, 68, 66, 71, 76, 74, 72, 70, 68, 66, 64, 62, 67, 72, 70, 75, 80, 78, 83, 81, 86, 91, 89, 94, 99, 97, 102, 100, 98, 103, 101, 106, 104, 102, 100]

cp's OEIS Frontend

A080901 a(1)=2; for n>1, a(n)=a(n-1)-2 if n is already in the sequence, a(n)=a(n-1)+5 otherwise.

Table of values

List of values

n	a(n)
1	2
2	0
3	5
4	10
5	8
6	13
7	18
8	16
9	21
10	19
11	24
12	29
13	27
14	32
15	37
16	35
17	40
18	38
19	36
20	41
21	39
22	44
23	49
24	47
25	52
26	57
27	55
28	60
29	58
30	63
31	68
32	66
33	71
34	76
35	74
36	72
37	70
38	68
39	66
40	64
41	62
42	67
43	72
44	70
45	75
46	80
47	78
48	83
49	81
50	86
51	91
52	89
53	94
54	99
55	97
56	102
57	100
58	98
59	103
60	101
61	106
62	104
63	102
64	100

n	a(n)
1	2
2	0
3	5
4	10
5	8
6	13
7	18
8	16
9	21
10	19
11	24
12	29
13	27
14	32
15	37
16	35
17	40
18	38
19	36
20	41
21	39
22	44
23	49
24	47
25	52
26	57
27	55
28	60
29	58
30	63
31	68
32	66
33	71
34	76
35	74
36	72
37	70
38	68
39	66
40	64
41	62
42	67
43	72
44	70
45	75
46	80
47	78
48	83
49	81
50	86
51	91
52	89
53	94
54	99
55	97
56	102
57	100
58	98
59	103
60	101
61	106
62	104
63	102
64	100

n	a(n)
1	2
2	0
3	5
4	10
5	8
6	13
7	18
8	16
9	21
10	19
11	24
12	29
13	27
14	32
15	37
16	35
17	40
18	38
19	36
20	41
21	39
22	44
23	49
24	47
25	52
26	57
27	55
28	60
29	58
30	63
31	68
32	66
33	71
34	76
35	74
36	72
37	70
38	68
39	66
40	64
41	62
42	67
43	72
44	70
45	75
46	80
47	78
48	83
49	81
50	86
51	91
52	89
53	94
54	99
55	97
56	102
57	100
58	98
59	103
60	101
61	106
62	104
63	102
64	100