A063104 - cp's OEIS frontend

A063104 a(0) = 0, a(n) = smallest composite k such that phi(k + 2^n) = phi(k) + 2^n; also cototient(k + 2^n) = cototient(k).

n	a(n)
0	0
1	6
2	12
3	24
4	39
5	84
6	69
7	75
8	213
9	1092
10	249
11	1131
12	8736
13	13413
14	21201
15	1275
16	2193
17	279552
18	98337
19	968727
20	71085
21	2783555
22	646869
23	3145959
24	1805781
25	5798435
26	787605
27	27962075
28	2073033
29	282181709
30	1150329
31	10380353
32	516201
33	150807855
34	141521295
35	860867981

[0, 6, 12, 24, 39, 84, 69, 75, 213, 1092, 249, 1131, 8736, 13413, 21201, 1275, 2193, 279552, 98337, 968727, 71085, 2783555, 646869, 3145959, 1805781, 5798435, 787605, 27962075, 2073033, 282181709, 1150329, 10380353, 516201, 150807855, 141521295, 860867981]

cp's OEIS Frontend

A063104 a(0) = 0, a(n) = smallest composite k such that phi(k + 2^n) = phi(k) + 2^n; also cototient(k + 2^n) = cototient(k).

Table of values

List of values