A048859 - cp's OEIS frontend

A048859 A sieve: keep the first 2 numbers, delete the next 3 numbers; keep the next 3 numbers, delete the next 4 numbers; keep the next 4 numbers, delete the next 5 numbers; and so on. In other words, keep the next k numbers and delete the next k+1 numbers, for k = 2, 3, ...

n	a(n)
1	1
2	2
3	6
4	7
5	8
6	13
7	14
8	15
9	16
10	22
11	23
12	24
13	25
14	26
15	33
16	34
17	35
18	36
19	37
20	38
21	46
22	47
23	48
24	49
25	50
26	51
27	52
28	61
29	62
30	63
31	64
32	65
33	66
34	67
35	68
36	78
37	79
38	80
39	81
40	82
41	83
42	84
43	85
44	86
45	97
46	98
47	99
48	100
49	101
50	102
51	103
52	104
53	105
54	106
55	118
56	119
57	120
58	121
59	122
60	123
61	124
62	125
63	126
64	127
65	128

[1, 2, 6, 7, 8, 13, 14, 15, 16, 22, 23, 24, 25, 26, 33, 34, 35, 36, 37, 38, 46, 47, 48, 49, 50, 51, 52, 61, 62, 63, 64, 65, 66, 67, 68, 78, 79, 80, 81, 82, 83, 84, 85, 86, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128]

cp's OEIS Frontend

A048859 A sieve: keep the first 2 numbers, delete the next 3 numbers; keep the next 3 numbers, delete the next 4 numbers; keep the next 4 numbers, delete the next 5 numbers; and so on. In other words, keep the next k numbers and delete the next k+1 numbers, for k = 2, 3, ...

Table of values

List of values

n	a(n)
1	1
2	2
3	6
4	7
5	8
6	13
7	14
8	15
9	16
10	22
11	23
12	24
13	25
14	26
15	33
16	34
17	35
18	36
19	37
20	38
21	46
22	47
23	48
24	49
25	50
26	51
27	52
28	61
29	62
30	63
31	64
32	65
33	66
34	67
35	68
36	78
37	79
38	80
39	81
40	82
41	83
42	84
43	85
44	86
45	97
46	98
47	99
48	100
49	101
50	102
51	103
52	104
53	105
54	106
55	118
56	119
57	120
58	121
59	122
60	123
61	124
62	125
63	126
64	127
65	128

n	a(n)
1	1
2	2
3	6
4	7
5	8
6	13
7	14
8	15
9	16
10	22
11	23
12	24
13	25
14	26
15	33
16	34
17	35
18	36
19	37
20	38
21	46
22	47
23	48
24	49
25	50
26	51
27	52
28	61
29	62
30	63
31	64
32	65
33	66
34	67
35	68
36	78
37	79
38	80
39	81
40	82
41	83
42	84
43	85
44	86
45	97
46	98
47	99
48	100
49	101
50	102
51	103
52	104
53	105
54	106
55	118
56	119
57	120
58	121
59	122
60	123
61	124
62	125
63	126
64	127
65	128

n	a(n)
1	1
2	2
3	6
4	7
5	8
6	13
7	14
8	15
9	16
10	22
11	23
12	24
13	25
14	26
15	33
16	34
17	35
18	36
19	37
20	38
21	46
22	47
23	48
24	49
25	50
26	51
27	52
28	61
29	62
30	63
31	64
32	65
33	66
34	67
35	68
36	78
37	79
38	80
39	81
40	82
41	83
42	84
43	85
44	86
45	97
46	98
47	99
48	100
49	101
50	102
51	103
52	104
53	105
54	106
55	118
56	119
57	120
58	121
59	122
60	123
61	124
62	125
63	126
64	127
65	128