A270439 - cp's OEIS frontend

A270439 Alternating sum of nonsquares (A000037).

n	a(n)
1	2
2	-1
3	4
4	-2
5	5
6	-3
7	7
8	-4
9	8
10	-5
11	9
12	-6
13	11
14	-7
15	12
16	-8
17	13
18	-9
19	14
20	-10
21	16
22	-11
23	17
24	-12
25	18
26	-13
27	19
28	-14
29	20
30	-15
31	22
32	-16
33	23
34	-17
35	24
36	-18
37	25
38	-19
39	26
40	-20
41	27
42	-21
43	29
44	-22
45	30
46	-23
47	31
48	-24
49	32
50	-25
51	33
52	-26
53	34
54	-27
55	35
56	-28
57	37
58	-29
59	38
60	-30
61	39
62	-31
63	40
64	-32
65	41
66	-33
67	42
68	-34
69	43
70	-35
71	44
72	-36
73	46
74	-37
75	47

[2, -1, 4, -2, 5, -3, 7, -4, 8, -5, 9, -6, 11, -7, 12, -8, 13, -9, 14, -10, 16, -11, 17, -12, 18, -13, 19, -14, 20, -15, 22, -16, 23, -17, 24, -18, 25, -19, 26, -20, 27, -21, 29, -22, 30, -23, 31, -24, 32, -25, 33, -26, 34, -27, 35, -28, 37, -29, 38, -30, 39, -31, 40, -32, 41, -33, 42, -34, 43, -35, 44, -36, 46, -37, 47]

cp's OEIS Frontend

A270439 Alternating sum of nonsquares (A000037).

Table of values

List of values

n	a(n)
1	2
2	-1
3	4
4	-2
5	5
6	-3
7	7
8	-4
9	8
10	-5
11	9
12	-6
13	11
14	-7
15	12
16	-8
17	13
18	-9
19	14
20	-10
21	16
22	-11
23	17
24	-12
25	18
26	-13
27	19
28	-14
29	20
30	-15
31	22
32	-16
33	23
34	-17
35	24
36	-18
37	25
38	-19
39	26
40	-20
41	27
42	-21
43	29
44	-22
45	30
46	-23
47	31
48	-24
49	32
50	-25
51	33
52	-26
53	34
54	-27
55	35
56	-28
57	37
58	-29
59	38
60	-30
61	39
62	-31
63	40
64	-32
65	41
66	-33
67	42
68	-34
69	43
70	-35
71	44
72	-36
73	46
74	-37
75	47

n	a(n)
1	2
2	-1
3	4
4	-2
5	5
6	-3
7	7
8	-4
9	8
10	-5
11	9
12	-6
13	11
14	-7
15	12
16	-8
17	13
18	-9
19	14
20	-10
21	16
22	-11
23	17
24	-12
25	18
26	-13
27	19
28	-14
29	20
30	-15
31	22
32	-16
33	23
34	-17
35	24
36	-18
37	25
38	-19
39	26
40	-20
41	27
42	-21
43	29
44	-22
45	30
46	-23
47	31
48	-24
49	32
50	-25
51	33
52	-26
53	34
54	-27
55	35
56	-28
57	37
58	-29
59	38
60	-30
61	39
62	-31
63	40
64	-32
65	41
66	-33
67	42
68	-34
69	43
70	-35
71	44
72	-36
73	46
74	-37
75	47

n	a(n)
1	2
2	-1
3	4
4	-2
5	5
6	-3
7	7
8	-4
9	8
10	-5
11	9
12	-6
13	11
14	-7
15	12
16	-8
17	13
18	-9
19	14
20	-10
21	16
22	-11
23	17
24	-12
25	18
26	-13
27	19
28	-14
29	20
30	-15
31	22
32	-16
33	23
34	-17
35	24
36	-18
37	25
38	-19
39	26
40	-20
41	27
42	-21
43	29
44	-22
45	30
46	-23
47	31
48	-24
49	32
50	-25
51	33
52	-26
53	34
54	-27
55	35
56	-28
57	37
58	-29
59	38
60	-30
61	39
62	-31
63	40
64	-32
65	41
66	-33
67	42
68	-34
69	43
70	-35
71	44
72	-36
73	46
74	-37
75	47