A286497 - cp's OEIS frontend

A286497 Prime power Giuga numbers: composite numbers n > 1 such that -1/n + sum 1/p^k = 1, where the sum is over the prime powers p^k dividing n.

n	a(n)
1	12
2	30
3	56
4	306
5	380
6	858
7	992
8	1722
9	2552
10	2862
11	16256
12	30704
13	66198
14	73712
15	86142
16	249500
17	629802
18	1703872
19	6127552
20	16191736
21	19127502
22	35359900
23	67100672
24	101999900
25	172173762
26	182552538
27	266677578
28	575688042
29	1180712682
30	2214408306
31	6179139056
32	17179738112
33	21083999500

[12, 30, 56, 306, 380, 858, 992, 1722, 2552, 2862, 16256, 30704, 66198, 73712, 86142, 249500, 629802, 1703872, 6127552, 16191736, 19127502, 35359900, 67100672, 101999900, 172173762, 182552538, 266677578, 575688042, 1180712682, 2214408306, 6179139056, 17179738112, 21083999500]

cp's OEIS Frontend

A286497 Prime power Giuga numbers: composite numbers n > 1 such that -1/n + sum 1/p^k = 1, where the sum is over the prime powers p^k dividing n.

Table of values

List of values