A141214 - cp's OEIS frontend

A141214 Defining A to be the interior angle of a regular polygon, the number of constructible regular polygons such that A is in a field extension <= degree 2^n, starting with n=0. This is also the number of values of x such that phi(x)/2 is a power of 2 <= 2^n (where phi is Euler's phi function), also starting with n=0.

n	a(n)
0	3
1	7
2	12
3	18
4	25
5	33
6	42
7	52
8	63
9	75
10	88
11	102
12	117
13	133
14	150
15	168
16	187
17	207
18	228
19	250
20	273
21	297
22	322
23	348
24	375
25	403
26	432
27	462
28	493
29	525
30	558
31	592
32	626
33	660
34	694

[3, 7, 12, 18, 25, 33, 42, 52, 63, 75, 88, 102, 117, 133, 150, 168, 187, 207, 228, 250, 273, 297, 322, 348, 375, 403, 432, 462, 493, 525, 558, 592, 626, 660, 694]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
0	3
1	7
2	12
3	18
4	25
5	33
6	42
7	52
8	63
9	75
10	88
11	102
12	117
13	133
14	150
15	168
16	187
17	207
18	228
19	250
20	273
21	297
22	322
23	348
24	375
25	403
26	432
27	462
28	493
29	525
30	558
31	592
32	626
33	660
34	694

n	a(n)
0	3
1	7
2	12
3	18
4	25
5	33
6	42
7	52
8	63
9	75
10	88
11	102
12	117
13	133
14	150
15	168
16	187
17	207
18	228
19	250
20	273
21	297
22	322
23	348
24	375
25	403
26	432
27	462
28	493
29	525
30	558
31	592
32	626
33	660
34	694

n	a(n)
0	3
1	7
2	12
3	18
4	25
5	33
6	42
7	52
8	63
9	75
10	88
11	102
12	117
13	133
14	150
15	168
16	187
17	207
18	228
19	250
20	273
21	297
22	322
23	348
24	375
25	403
26	432
27	462
28	493
29	525
30	558
31	592
32	626
33	660
34	694