A237352 - cp's OEIS frontend

A237352 a(1)=1; for n>1, a(n) is the smallest positive integer for which sigma(a(n)) is a proper multiple of sigma(a(n-1)).

n	a(n)
1	1
2	2
3	5
4	6
5	14
6	30
7	66
8	138
9	210
10	462
11	930
12	1974
13	3810
14	6510
15	14322
16	26670
17	58674
18	118110
19	245730
20	498666
21	826770
22	1720110
23	3784242
24	7617630
25	15728610
26	27524910
27	53323410
28	110100270
29	218453970
30	480598734
31	853272210
32	1877198862
33	3413108370
34	6772073070

[1, 2, 5, 6, 14, 30, 66, 138, 210, 462, 930, 1974, 3810, 6510, 14322, 26670, 58674, 118110, 245730, 498666, 826770, 1720110, 3784242, 7617630, 15728610, 27524910, 53323410, 110100270, 218453970, 480598734, 853272210, 1877198862, 3413108370, 6772073070]

cp's OEIS Frontend

A237352 a(1)=1; for n>1, a(n) is the smallest positive integer for which sigma(a(n)) is a proper multiple of sigma(a(n-1)).

Table of values

List of values