A090552 - cp's OEIS frontend

A090552 a(1)=1; for n>1, a(n) is the smallest positive integer for which sigma(a(n)) is a multiple of sigma(a(n-1)).

n	a(n)
1	1
2	2
3	5
4	6
5	11
6	14
7	15
8	23
9	30
10	46
11	51
12	55
13	66
14	70
15	94
16	115
17	119
18	138
19	154
20	165
21	210
22	282
23	310
24	322
25	345
26	357
27	382
28	385
29	462
30	658
31	682
32	705
33	759
34	766
35	805
36	930
37	966
38	1146
39	1155
40	1270
41	1426
42	1491
43	1551
44	1581
45	1645
46	1705
47	1771
48	1915
49	1974
50	2046
51	2170
52	2298
53	2415

[1, 2, 5, 6, 11, 14, 15, 23, 30, 46, 51, 55, 66, 70, 94, 115, 119, 138, 154, 165, 210, 282, 310, 322, 345, 357, 382, 385, 462, 658, 682, 705, 759, 766, 805, 930, 966, 1146, 1155, 1270, 1426, 1491, 1551, 1581, 1645, 1705, 1771, 1915, 1974, 2046, 2170, 2298, 2415]

cp's OEIS Frontend

A090552 a(1)=1; for n>1, a(n) is the smallest positive integer for which sigma(a(n)) is a multiple of sigma(a(n-1)).

Table of values

List of values