A236375 - cp's OEIS frontend

A236375 Positive integers m with 2^(m-1)*phi(m) - 1 prime, where phi(.) is Euler's totient function.

n	a(n)
1	3
2	7
3	12
4	15
5	18
6	31
7	42
8	108
9	124
10	140
11	143
12	155
13	207
14	327
15	386
16	463
17	514
18	823
19	925
20	1035
21	1393
22	1425
23	2425
24	3873
25	5091
26	5314
27	5946
28	12813
29	14198
30	15823
31	19932
32	22747
33	37989
34	38772

[3, 7, 12, 15, 18, 31, 42, 108, 124, 140, 143, 155, 207, 327, 386, 463, 514, 823, 925, 1035, 1393, 1425, 2425, 3873, 5091, 5314, 5946, 12813, 14198, 15823, 19932, 22747, 37989, 38772]

cp's OEIS Frontend

A236375 Positive integers m with 2^(m-1)*phi(m) - 1 prime, where phi(.) is Euler's totient function.

Table of values

List of values