A056772 - cp's OEIS frontend

A056772 Numbers k such that phi(k+4) = phi(k) + 4, where phi(k) = A000010(k) is Euler's totient function.

n	a(n)
1	3
2	7
3	12
4	13
5	18
6	19
7	24
8	28
9	36
10	37
11	40
12	43
13	66
14	67
15	79
16	88
17	97
18	103
19	109
20	124
21	127
22	163
23	184
24	193
25	223
26	229
27	232
28	277
29	307
30	313
31	328
32	349
33	379
34	397
35	424
36	439
37	457
38	463
39	487
40	499
41	508
42	613
43	643
44	664
45	673
46	712
47	739
48	757
49	769
50	823
51	853
52	859
53	877
54	883
55	904
56	907

[3, 7, 12, 13, 18, 19, 24, 28, 36, 37, 40, 43, 66, 67, 79, 88, 97, 103, 109, 124, 127, 163, 184, 193, 223, 229, 232, 277, 307, 313, 328, 349, 379, 397, 424, 439, 457, 463, 487, 499, 508, 613, 643, 664, 673, 712, 739, 757, 769, 823, 853, 859, 877, 883, 904, 907]

cp's OEIS Frontend

A056772 Numbers k such that phi(k+4) = phi(k) + 4, where phi(k) = A000010(k) is Euler's totient function.

Table of values

List of values

n	a(n)
1	3
2	7
3	12
4	13
5	18
6	19
7	24
8	28
9	36
10	37
11	40
12	43
13	66
14	67
15	79
16	88
17	97
18	103
19	109
20	124
21	127
22	163
23	184
24	193
25	223
26	229
27	232
28	277
29	307
30	313
31	328
32	349
33	379
34	397
35	424
36	439
37	457
38	463
39	487
40	499
41	508
42	613
43	643
44	664
45	673
46	712
47	739
48	757
49	769
50	823
51	853
52	859
53	877
54	883
55	904
56	907

n	a(n)
1	3
2	7
3	12
4	13
5	18
6	19
7	24
8	28
9	36
10	37
11	40
12	43
13	66
14	67
15	79
16	88
17	97
18	103
19	109
20	124
21	127
22	163
23	184
24	193
25	223
26	229
27	232
28	277
29	307
30	313
31	328
32	349
33	379
34	397
35	424
36	439
37	457
38	463
39	487
40	499
41	508
42	613
43	643
44	664
45	673
46	712
47	739
48	757
49	769
50	823
51	853
52	859
53	877
54	883
55	904
56	907

n	a(n)
1	3
2	7
3	12
4	13
5	18
6	19
7	24
8	28
9	36
10	37
11	40
12	43
13	66
14	67
15	79
16	88
17	97
18	103
19	109
20	124
21	127
22	163
23	184
24	193
25	223
26	229
27	232
28	277
29	307
30	313
31	328
32	349
33	379
34	397
35	424
36	439
37	457
38	463
39	487
40	499
41	508
42	613
43	643
44	664
45	673
46	712
47	739
48	757
49	769
50	823
51	853
52	859
53	877
54	883
55	904
56	907