A255585 - cp's OEIS frontend

A255585 Composite numbers k such that Sum_{i=1..t-1} d(i+1)/d(i) is prime, where d(1), ..., d(t) are the divisors of k in ascending order.

n	a(n)
1	50
2	98
3	108
4	242
5	338
6	375
7	578
8	1029
9	1058
10	1458
11	1922
12	2738
13	3072
14	3362
15	3993
16	4418
17	5618
18	7442
19	8978
20	9216
21	10658
22	13778
23	14739
24	18818
25	20402
26	20577
27	21218
28	22898
29	26985
30	31250
31	34322
32	45602
33	46875
34	49298
35	55778
36	58564
37	59858
38	72962
39	73167
40	74498
41	78732

[50, 98, 108, 242, 338, 375, 578, 1029, 1058, 1458, 1922, 2738, 3072, 3362, 3993, 4418, 5618, 7442, 8978, 9216, 10658, 13778, 14739, 18818, 20402, 20577, 21218, 22898, 26985, 31250, 34322, 45602, 46875, 49298, 55778, 58564, 59858, 72962, 73167, 74498, 78732]

cp's OEIS Frontend

A255585 Composite numbers k such that Sum_{i=1..t-1} d(i+1)/d(i) is prime, where d(1), ..., d(t) are the divisors of k in ascending order.

Table of values

List of values