A065656 - cp's OEIS frontend

A065656 Composite numbers k such that sigma(k)phi(k) + 2(k+1) is a square.

n	a(n)
1	1169
2	7777
3	41111
4	46097
5	668167
6	846817
7	2107519
8	3612769
9	17424241
10	30666527
11	37526993
12	56323393
13	214746055
14	383523857
15	512376769
16	1021934641
17	1228492849
18	1303949599
19	4056001351
20	7425397169
21	17073544447
22	17859428369
23	18452226887
24	46874737969
25	51411954391

[1169, 7777, 41111, 46097, 668167, 846817, 2107519, 3612769, 17424241, 30666527, 37526993, 56323393, 214746055, 383523857, 512376769, 1021934641, 1228492849, 1303949599, 4056001351, 7425397169, 17073544447, 17859428369, 18452226887, 46874737969, 51411954391]

cp's OEIS Frontend

A065656 Composite numbers k such that sigma(k)phi(k) + 2(k+1) is a square.

Table of values

List of values

cp's OEIS Frontend

A065656 Composite numbers k such that sigma(k)*phi(k) + 2*(k+1) is a square.

Table of values

List of values

A065656 Composite numbers k such that sigma(k)phi(k) + 2(k+1) is a square.