A039772 - cp's OEIS frontend

A039772 Even numbers k such that phi(k) and k-1 are distinct and have a common factor > 1.

n	a(n)
1	28
2	52
3	66
4	70
5	76
6	112
7	124
8	130
9	148
10	154
11	172
12	176
13	186
14	190
15	196
16	208
17	232
18	238
19	244
20	246
21	268
22	276
23	280
24	286
25	292
26	304
27	310
28	316
29	322
30	344
31	364
32	366
33	370
34	388
35	396
36	406
37	412
38	418
39	426
40	430
41	436
42	442
43	448
44	490
45	496
46	506
47	508
48	520
49	532
50	556
51	568
52	574

[28, 52, 66, 70, 76, 112, 124, 130, 148, 154, 172, 176, 186, 190, 196, 208, 232, 238, 244, 246, 268, 276, 280, 286, 292, 304, 310, 316, 322, 344, 364, 366, 370, 388, 396, 406, 412, 418, 426, 430, 436, 442, 448, 490, 496, 506, 508, 520, 532, 556, 568, 574]

cp's OEIS Frontend

A039772 Even numbers k such that phi(k) and k-1 are distinct and have a common factor > 1.

Table of values

List of values

n	a(n)
1	28
2	52
3	66
4	70
5	76
6	112
7	124
8	130
9	148
10	154
11	172
12	176
13	186
14	190
15	196
16	208
17	232
18	238
19	244
20	246
21	268
22	276
23	280
24	286
25	292
26	304
27	310
28	316
29	322
30	344
31	364
32	366
33	370
34	388
35	396
36	406
37	412
38	418
39	426
40	430
41	436
42	442
43	448
44	490
45	496
46	506
47	508
48	520
49	532
50	556
51	568
52	574

n	a(n)
1	28
2	52
3	66
4	70
5	76
6	112
7	124
8	130
9	148
10	154
11	172
12	176
13	186
14	190
15	196
16	208
17	232
18	238
19	244
20	246
21	268
22	276
23	280
24	286
25	292
26	304
27	310
28	316
29	322
30	344
31	364
32	366
33	370
34	388
35	396
36	406
37	412
38	418
39	426
40	430
41	436
42	442
43	448
44	490
45	496
46	506
47	508
48	520
49	532
50	556
51	568
52	574

n	a(n)
1	28
2	52
3	66
4	70
5	76
6	112
7	124
8	130
9	148
10	154
11	172
12	176
13	186
14	190
15	196
16	208
17	232
18	238
19	244
20	246
21	268
22	276
23	280
24	286
25	292
26	304
27	310
28	316
29	322
30	344
31	364
32	366
33	370
34	388
35	396
36	406
37	412
38	418
39	426
40	430
41	436
42	442
43	448
44	490
45	496
46	506
47	508
48	520
49	532
50	556
51	568
52	574