A001836 - cp's OEIS frontend

A001836 Numbers k such that phi(2k-1) < phi(2k), where phi is Euler's totient function A000010.

n	a(n)
1	53
2	83
3	158
4	263
5	293
6	368
7	578
8	683
9	743
10	788
11	878
12	893
13	908
14	998
15	1073
16	1103
17	1208
18	1238
19	1268
20	1403
21	1418
22	1502
23	1523
24	1658
25	1733
26	1838
27	1943
28	1964
29	2048
30	2063
31	2153
32	2228
33	2243
34	2258
35	2363
36	2393
37	2423
38	2468
39	2558
40	2573
41	2633
42	2657
43	2678

[53, 83, 158, 263, 293, 368, 578, 683, 743, 788, 878, 893, 908, 998, 1073, 1103, 1208, 1238, 1268, 1403, 1418, 1502, 1523, 1658, 1733, 1838, 1943, 1964, 2048, 2063, 2153, 2228, 2243, 2258, 2363, 2393, 2423, 2468, 2558, 2573, 2633, 2657, 2678]

cp's OEIS Frontend

A001836 Numbers k such that phi(2k-1) < phi(2k), where phi is Euler's totient function A000010.

Table of values

List of values