A374219 - cp's OEIS frontend

A374219 Composite numbers k such that A347381 obtains the same value for all divisors of k that are larger than one, where A347381 is the distance from n to the nearest common ancestor of n and sigma(n) in the Doudna-tree (A005940).

n	a(n)
1	15
2	77
3	1403
4	3127
5	3139
6	8383
7	15247
8	45151
9	47263
10	54053
11	58339
12	65473
13	73813
14	79567
15	89951
16	94957
17	155011
18	211621
19	293323
20	333961
21	360883
22	441901
23	444853
24	496597
25	612893
26	623659
27	646367
28	727393
29	786193
30	796723
31	1334083
32	1456813
33	1572491
34	2103379
35	2139793
36	2477509
37	2668867
38	2735539
39	2826787
40	2903591
41	3121133

[15, 77, 1403, 3127, 3139, 8383, 15247, 45151, 47263, 54053, 58339, 65473, 73813, 79567, 89951, 94957, 155011, 211621, 293323, 333961, 360883, 441901, 444853, 496597, 612893, 623659, 646367, 727393, 786193, 796723, 1334083, 1456813, 1572491, 2103379, 2139793, 2477509, 2668867, 2735539, 2826787, 2903591, 3121133]

cp's OEIS Frontend

A374219 Composite numbers k such that A347381 obtains the same value for all divisors of k that are larger than one, where A347381 is the distance from n to the nearest common ancestor of n and sigma(n) in the Doudna-tree (A005940).

Table of values

List of values