A342665 - cp's OEIS frontend

A342665 Numbers k for which phi(k)+1 is a multiple of d(k), where phi is Euler totient function (A000010) and d(n) gives the number of divisors of n (A000005).

n	a(n)
1	1
2	2
3	4
4	25
5	81
6	121
7	289
8	529
9	841
10	1681
11	2209
12	2809
13	3481
14	5041
15	6889
16	7921
17	10201
18	11449
19	12100
20	12769
21	17161
22	18769
23	22201
24	27889
25	28561
26	28900
27	29929
28	32041
29	36481
30	38809
31	51529
32	54289
33	57121
34	63001
35	66049
36	69169
37	72361
38	78961
39	84100
40	85849
41	96721
42	100489
43	120409
44	124609
45	128881
46	146689
47	151321
48	160801
49	175561

[1, 2, 4, 25, 81, 121, 289, 529, 841, 1681, 2209, 2809, 3481, 5041, 6889, 7921, 10201, 11449, 12100, 12769, 17161, 18769, 22201, 27889, 28561, 28900, 29929, 32041, 36481, 38809, 51529, 54289, 57121, 63001, 66049, 69169, 72361, 78961, 84100, 85849, 96721, 100489, 120409, 124609, 128881, 146689, 151321, 160801, 175561]

cp's OEIS Frontend

A342665 Numbers k for which phi(k)+1 is a multiple of d(k), where phi is Euler totient function (A000010) and d(n) gives the number of divisors of n (A000005).

Table of values

List of values