A293059 - cp's OEIS frontend

A293059 Numbers k such that sigma(phi(k))/k > sigma(phi(m))/m for all m < k, where sigma is the sum of divisors function (A000203) and phi is Euler's totient function (A000010).

n	a(n)
1	1
2	5
3	7
4	13
5	31
6	37
7	61
8	181
9	241
10	421
11	899
12	1321
13	1333
14	1763
15	2161
16	2521
17	5183
18	7561
19	12601
20	15121
21	28187
22	30241
23	55441
24	110881
25	167137
26	278263
27	332641
28	555911
29	666917
30	722473
31	1443853
32	2165407
33	3607403
34	4324321
35	7212581
36	8654539
37	10817761
38	21631147
39	36768847

[1, 5, 7, 13, 31, 37, 61, 181, 241, 421, 899, 1321, 1333, 1763, 2161, 2521, 5183, 7561, 12601, 15121, 28187, 30241, 55441, 110881, 167137, 278263, 332641, 555911, 666917, 722473, 1443853, 2165407, 3607403, 4324321, 7212581, 8654539, 10817761, 21631147, 36768847]

cp's OEIS Frontend

A293059 Numbers k such that sigma(phi(k))/k > sigma(phi(m))/m for all m < k, where sigma is the sum of divisors function (A000203) and phi is Euler's totient function (A000010).

Table of values

List of values