A127366 - cp's OEIS frontend

A127366 Let m = floor(sqrt(n)); if n and m have the same parity, a(n) = n + m, otherwise a(n) = n - m.

n	a(n)
0	0
1	2
2	1
3	4
4	6
5	3
6	8
7	5
8	10
9	12
10	7
11	14
12	9
13	16
14	11
15	18
16	20
17	13
18	22
19	15
20	24
21	17
22	26
23	19
24	28
25	30
26	21
27	32
28	23
29	34
30	25
31	36
32	27
33	38
34	29
35	40
36	42
37	31
38	44
39	33
40	46
41	35
42	48
43	37
44	50
45	39
46	52
47	41
48	54
49	56
50	43
51	58
52	45
53	60
54	47
55	62
56	49
57	64
58	51
59	66
60	53
61	68
62	55
63	70
64	72
65	57
66	74
67	59
68	76
69	61
70	78
71	63
72	80

[0, 2, 1, 4, 6, 3, 8, 5, 10, 12, 7, 14, 9, 16, 11, 18, 20, 13, 22, 15, 24, 17, 26, 19, 28, 30, 21, 32, 23, 34, 25, 36, 27, 38, 29, 40, 42, 31, 44, 33, 46, 35, 48, 37, 50, 39, 52, 41, 54, 56, 43, 58, 45, 60, 47, 62, 49, 64, 51, 66, 53, 68, 55, 70, 72, 57, 74, 59, 76, 61, 78, 63, 80]

cp's OEIS Frontend

A127366 Let m = floor(sqrt(n)); if n and m have the same parity, a(n) = n + m, otherwise a(n) = n - m.

Table of values

List of values

n	a(n)
0	0
1	2
2	1
3	4
4	6
5	3
6	8
7	5
8	10
9	12
10	7
11	14
12	9
13	16
14	11
15	18
16	20
17	13
18	22
19	15
20	24
21	17
22	26
23	19
24	28
25	30
26	21
27	32
28	23
29	34
30	25
31	36
32	27
33	38
34	29
35	40
36	42
37	31
38	44
39	33
40	46
41	35
42	48
43	37
44	50
45	39
46	52
47	41
48	54
49	56
50	43
51	58
52	45
53	60
54	47
55	62
56	49
57	64
58	51
59	66
60	53
61	68
62	55
63	70
64	72
65	57
66	74
67	59
68	76
69	61
70	78
71	63
72	80

n	a(n)
0	0
1	2
2	1
3	4
4	6
5	3
6	8
7	5
8	10
9	12
10	7
11	14
12	9
13	16
14	11
15	18
16	20
17	13
18	22
19	15
20	24
21	17
22	26
23	19
24	28
25	30
26	21
27	32
28	23
29	34
30	25
31	36
32	27
33	38
34	29
35	40
36	42
37	31
38	44
39	33
40	46
41	35
42	48
43	37
44	50
45	39
46	52
47	41
48	54
49	56
50	43
51	58
52	45
53	60
54	47
55	62
56	49
57	64
58	51
59	66
60	53
61	68
62	55
63	70
64	72
65	57
66	74
67	59
68	76
69	61
70	78
71	63
72	80

n	a(n)
0	0
1	2
2	1
3	4
4	6
5	3
6	8
7	5
8	10
9	12
10	7
11	14
12	9
13	16
14	11
15	18
16	20
17	13
18	22
19	15
20	24
21	17
22	26
23	19
24	28
25	30
26	21
27	32
28	23
29	34
30	25
31	36
32	27
33	38
34	29
35	40
36	42
37	31
38	44
39	33
40	46
41	35
42	48
43	37
44	50
45	39
46	52
47	41
48	54
49	56
50	43
51	58
52	45
53	60
54	47
55	62
56	49
57	64
58	51
59	66
60	53
61	68
62	55
63	70
64	72
65	57
66	74
67	59
68	76
69	61
70	78
71	63
72	80