A258319 - cp's OEIS frontend

A258319 Numbers n such that n = concat(a,b) and n = phi(n) + phi(a) + phi(b), with a>0 and b>0, where phi(n) is the Euler totient function of n.

n	a(n)
1	25
2	177
3	1177
4	2501
5	17105
6	21337
7	22681
8	32581
9	217009
10	409501
11	561601
12	577501
13	861841
14	1025821
15	1401841
16	1738081
17	2836465
18	8331361
19	10284193
20	19971901
21	20103001
22	27835921
23	31949921
24	34897501
25	100763053
26	107314217
27	111512701
28	121806001
29	150658561
30	155874001

[25, 177, 1177, 2501, 17105, 21337, 22681, 32581, 217009, 409501, 561601, 577501, 861841, 1025821, 1401841, 1738081, 2836465, 8331361, 10284193, 19971901, 20103001, 27835921, 31949921, 34897501, 100763053, 107314217, 111512701, 121806001, 150658561, 155874001]

cp's OEIS Frontend

A258319 Numbers n such that n = concat(a,b) and n = phi(n) + phi(a) + phi(b), with a>0 and b>0, where phi(n) is the Euler totient function of n.

Table of values

List of values