A357916 - cp's OEIS frontend

A357916 Primes p that can be written as phi(k) + d(k) for some k, where phi(k) = A000010(k) is Euler's totient function and d(k) = A000005(k) is the number of divisors of k.

n	a(n)
1	2
2	3
3	5
4	13
5	23
6	59
7	113
8	137
9	229
10	457
11	509
12	523
13	661
14	1021
15	2063
16	3541
17	3923
18	4973
19	5449
20	5521
21	9949
22	10103
23	10273
24	12659
25	14107
26	15601
27	16249
28	17033
29	22063
30	25321
31	29759
32	32507
33	34843
34	36293
35	37273
36	52501
37	54059
38	62753
39	68449
40	68909
41	89329
42	99409
43	103963
44	111347
45	125509
46	139297
47	146309
48	157231

[2, 3, 5, 13, 23, 59, 113, 137, 229, 457, 509, 523, 661, 1021, 2063, 3541, 3923, 4973, 5449, 5521, 9949, 10103, 10273, 12659, 14107, 15601, 16249, 17033, 22063, 25321, 29759, 32507, 34843, 36293, 37273, 52501, 54059, 62753, 68449, 68909, 89329, 99409, 103963, 111347, 125509, 139297, 146309, 157231]

cp's OEIS Frontend

A357916 Primes p that can be written as phi(k) + d(k) for some k, where phi(k) = A000010(k) is Euler's totient function and d(k) = A000005(k) is the number of divisors of k.

Table of values

List of values