A033631 - cp's OEIS frontend

A033631 Numbers k such that sigma(phi(k)) = sigma(k) where sigma is the sum of divisors function A000203 and phi is the Euler totient function A000010.

n	a(n)
1	1
2	87
3	362
4	1257
5	1798
6	5002
7	9374
8	21982
9	22436
10	25978
11	35306
12	38372
13	41559
14	50398
15	51706
16	53098
17	53314
18	56679
19	65307
20	68037
21	89067
22	108946
23	116619
24	124677
25	131882
26	136551
27	136762
28	138975
29	144014
30	160629
31	165554
32	170037
33	186231
34	192394
35	197806

[1, 87, 362, 1257, 1798, 5002, 9374, 21982, 22436, 25978, 35306, 38372, 41559, 50398, 51706, 53098, 53314, 56679, 65307, 68037, 89067, 108946, 116619, 124677, 131882, 136551, 136762, 138975, 144014, 160629, 165554, 170037, 186231, 192394, 197806]

cp's OEIS Frontend

A033631 Numbers k such that sigma(phi(k)) = sigma(k) where sigma is the sum of divisors function A000203 and phi is the Euler totient function A000010.

Table of values

List of values