A262750 - cp's OEIS frontend

A262750 Least positive integer z such that n - phi(z^2) = x^2 + y^2 for some integers x and y with xyz even and phi(k^2) < n for all 0 < k < z, or 0 if no such z exists, where phi(.) is Euler's totient function given by A000010.

n	a(n)
1	1
2	1
3	2
4	2
5	1
6	1
7	2
8	4
9	1
10	1
11	2
12	2
13	4
14	1
15	2
16	4
17	1
18	1
19	2
20	2
21	1
22	2
23	3
24	4
25	4
26	1
27	2
28	2
29	5
30	1
31	2
32	6
33	1
34	2
35	3
36	2
37	1
38	1
39	2
40	4
41	1
42	1
43	2
44	4
45	4
46	1
47	2
48	4
49	4
50	1
51	2
52	2
53	1
54	1
55	2
56	5
57	4
58	3
59	3
60	2
61	4
62	1
63	2
64	6
65	1
66	1
67	2
68	8
69	1
70	2
71	3
72	4
73	1
74	1
75	2
76	2
77	6
78	3
79	3
80	4
81	1
82	1
83	2
84	2
85	5
86	1
87	2
88	4
89	4
90	1
91	2
92	2
93	4
94	6
95	3
96	8
97	4
98	1
99	2
100	2

[1, 1, 2, 2, 1, 1, 2, 4, 1, 1, 2, 2, 4, 1, 2, 4, 1, 1, 2, 2, 1, 2, 3, 4, 4, 1, 2, 2, 5, 1, 2, 6, 1, 2, 3, 2, 1, 1, 2, 4, 1, 1, 2, 4, 4, 1, 2, 4, 4, 1, 2, 2, 1, 1, 2, 5, 4, 3, 3, 2, 4, 1, 2, 6, 1, 1, 2, 8, 1, 2, 3, 4, 1, 1, 2, 2, 6, 3, 3, 4, 1, 1, 2, 2, 5, 1, 2, 4, 4, 1, 2, 2, 4, 6, 3, 8, 4, 1, 2, 2]

cp's OEIS Frontend

A262750 Least positive integer z such that n - phi(z^2) = x^2 + y^2 for some integers x and y with xyz even and phi(k^2) < n for all 0 < k < z, or 0 if no such z exists, where phi(.) is Euler's totient function given by A000010.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	1
6	1
7	2
8	4
9	1
10	1
11	2
12	2
13	4
14	1
15	2
16	4
17	1
18	1
19	2
20	2
21	1
22	2
23	3
24	4
25	4
26	1
27	2
28	2
29	5
30	1
31	2
32	6
33	1
34	2
35	3
36	2
37	1
38	1
39	2
40	4
41	1
42	1
43	2
44	4
45	4
46	1
47	2
48	4
49	4
50	1
51	2
52	2
53	1
54	1
55	2
56	5
57	4
58	3
59	3
60	2
61	4
62	1
63	2
64	6
65	1
66	1
67	2
68	8
69	1
70	2
71	3
72	4
73	1
74	1
75	2
76	2
77	6
78	3
79	3
80	4
81	1
82	1
83	2
84	2
85	5
86	1
87	2
88	4
89	4
90	1
91	2
92	2
93	4
94	6
95	3
96	8
97	4
98	1
99	2
100	2

n	a(n)
1	1
2	1
3	2
4	2
5	1
6	1
7	2
8	4
9	1
10	1
11	2
12	2
13	4
14	1
15	2
16	4
17	1
18	1
19	2
20	2
21	1
22	2
23	3
24	4
25	4
26	1
27	2
28	2
29	5
30	1
31	2
32	6
33	1
34	2
35	3
36	2
37	1
38	1
39	2
40	4
41	1
42	1
43	2
44	4
45	4
46	1
47	2
48	4
49	4
50	1
51	2
52	2
53	1
54	1
55	2
56	5
57	4
58	3
59	3
60	2
61	4
62	1
63	2
64	6
65	1
66	1
67	2
68	8
69	1
70	2
71	3
72	4
73	1
74	1
75	2
76	2
77	6
78	3
79	3
80	4
81	1
82	1
83	2
84	2
85	5
86	1
87	2
88	4
89	4
90	1
91	2
92	2
93	4
94	6
95	3
96	8
97	4
98	1
99	2
100	2

cp's OEIS Frontend

A262750 Least positive integer z such that n - phi(z^2) = x^2 + y^2 for some integers x and y with x*y*z even and phi(k^2) < n for all 0 < k < z, or 0 if no such z exists, where phi(.) is Euler's totient function given by A000010.

Table of values

List of values

A262750 Least positive integer z such that n - phi(z^2) = x^2 + y^2 for some integers x and y with xyz even and phi(k^2) < n for all 0 < k < z, or 0 if no such z exists, where phi(.) is Euler's totient function given by A000010.

n	a(n)
1	1
2	1
3	2
4	2
5	1
6	1
7	2
8	4
9	1
10	1
11	2
12	2
13	4
14	1
15	2
16	4
17	1
18	1
19	2
20	2
21	1
22	2
23	3
24	4
25	4
26	1
27	2
28	2
29	5
30	1
31	2
32	6
33	1
34	2
35	3
36	2
37	1
38	1
39	2
40	4
41	1
42	1
43	2
44	4
45	4
46	1
47	2
48	4
49	4
50	1
51	2
52	2
53	1
54	1
55	2
56	5
57	4
58	3
59	3
60	2
61	4
62	1
63	2
64	6
65	1
66	1
67	2
68	8
69	1
70	2
71	3
72	4
73	1
74	1
75	2
76	2
77	6
78	3
79	3
80	4
81	1
82	1
83	2
84	2
85	5
86	1
87	2
88	4
89	4
90	1
91	2
92	2
93	4
94	6
95	3
96	8
97	4
98	1
99	2
100	2